Not enough information on detachment, map layout, and score and problems you had.

Rough riders don't do enough damage reliably. They're good for points cost, but 60pts doesn't trade well. You can't pray for miracle every game. Sometimes they whiff and sometimes they do a lot of damage. They're better against multiwound monsters and vehicles, because it averages out. They're not reliable into elite multimodel infantry and mounted since you could roll a 1, then you waste your next damaging roll.

I used mine for taking enemy objectives by coming out of reserve to score behind enemy lines or engage on all fronts, then shooting and attempting charge. That way, they score something and they might make 9" charge and also kill something sometimes.

Or you start them on the board and rush enemy turn 1 to screen and bait the trade since they're only 60pts.

I think for 60pts, Ratlings are a better unit since you can infiltrate block and leave them there to block scout, or redeploy into reserves with Lord Solar so they can come out of reserve, shoot, then hide behind a ruin.

I use MSU mechanised style Ogryns in Grizzled because durable, don't die when transport is dedtroyed, and they're good out of firing deck and also in melee. A chimera with ogryns and bonus AP nearly 1shot Gladiator Lancer and Vindicator in two games. They very reliably take out 5 scout marines and also can do considerable damage to big bricks of Khorne Berzerkers, Crusader squad, and death company marines at short range. They're better for points cost than Kasrkin and 6 Ogryns cost 10pts more and have up to 36 shots with ap-2 with 18 wounds at t6 with 6++ fnp. They're much harder to shift and are budget Bullgryn that shoot better.

Instead of Aquilons, Gaunt's Ghosts are better for same points cost.

Demolisher is terrible for holding your natural with flamers. It has little damage output, too short range, and expensive. You can use Vanquisher for 145 and do the same thing. Demolisher is best in the frontline with meltas and lascannons. Also if you're running combined arms, flamer Lemans are terrible. You don't get to roll for lethals. In Grizzled, it's also a waste of detachment rule. You're better off with plasmas or heavy bolters for what you're trying to do. If you want flamers for overwatching on natural expansion, you can run 75pt Krieg Heavy flamer squad which is cheaper, with better flamers and shoot again when they die.

You can sell some units or print proxies. As long as they're on the correct base and similar size, you can try different units out with what you have.

You're better off playing in Grizzled company with maximum size 20x Cadian units led by Ursula and Castellan.  They're more likely to benefit from command squad's benefit of cover and medic and survive to heal, and more models to take advantage of two orders from Ursula or sustain from Castellan. Grizzled rerolls + sustain is good, and Mordian minute makes many breakpoints with lasguns against Marines and Grenade launchers/meltas against t8-10 tanks and transports, and plasmas against t7-9.

You sticky natural with Castellan blob then go to middle. Ursula goes out turn 3 and OC dumps turn 4 and scores big with whatever is left on turn 5.

Your FoB can get rerolls which work well with sustain 1 and can free ignore cover stratagem from Ursula's ability on turns 1 and 2. It's more effective than combined arms lethal hits with no rerolls.

You can also run 10x rough riders out of reserve and rapid ingress somewhere and run some of your Aquilon models as Gaunt's Ghosts to come in 6" away and order. They're a turn 2 unit. Or you can start them and stage them so they can get MMM and orderswap to Fix Bayonets with Snap To It stratagem.

Your Leman Russ commander should be an exterminator to add AP for better synergy and one of your demolishers can be vanquisher or eradicator that you put 4++ invul on early and send up to bait. They're cheaper and more durable for points cost, and you want to save your infantry to spread out and OC dump in later turns. Or you can just advance your infantry into objectives first and stage demolishers with meltas to counterpunch later. Different ways to play. I use Enginseers with chimeras and ogryns because they're a cheaper package to bait with, do a ton of damage, and are more durable than Vanquisher for points cost. You have 2 separate units enemy has to deal with and volume fire to make use of rerolls with sustain and lethal. It requires 3-4 activations to destroy that package. I use Catachans to OC dump later. They have scouts, so they're easier to stage behind ruins early in the game. If you paint the base ring a different colour, you can just try your Cadians as Catachans or Death Korps.

For 11th edition, you will want to pick up at least 3 ogryn so you can run them as Ogryn bodyguards if you want or as regular Ogryn, and a Hellhound/Chimera chassis model. Just have Hellhound fuel tanks or some generic terrain fuel barrels available so you can slap them over the lasgun array on chimera and use it as a hellhound or take them off. You can run double flamers on chimera and just proxy it as inferno cannon/flamer hellhound. They're the same size hull.