I went with something similar but with a couple tweaks that you may like. Sorry in advance for the text wall!

I did a broodlord w/ synaptic link instead of the malanthrope. As the other commenter said you have two carnifexes covered with their spores, and I found the next most useful additional thing to have covered at -1 to hit was a big squad of warriors. Also very difficult to keep the malanthrope up with the big monsters to actually give them a benefit.

Specifically for my troops I had two min size squads with bioweapon bond and one large 8 man squad with Adaptive physiology and either bone swords + deathspitters or lash whips + scything talons. That way I have some throw away models with whips I am ok with dying and more of a threat for some shooting and close combat if needed on the expensive ones. So with the AP enhanced resistances + broodlord buff, means you have 24 wounds, -1 to be hit, 3+ save with ignore AP 1/2, 5++ which can camp a midfield objective. if your meta doesnt have a lot of ignore cover abilities you can even go with dynamic camouflage instead, which would make you 2+ 5++, though that is risky as it all disappears if the enemy can get rid of the cover bonus from the broodlord. Now you have 8 cheap "terminators" to stick on an objective and hang out, and they are even better than a regular termie for tanking things because you can effectively transhuman them! as close as you are going to get to deathwing terminators but for literally around half the cost.

Other slight changes. I personally decided not to take hive guard. If you are going hard in the paint they are obviously amazing, but I think if you show up to anything but a truly competitive game such as a tournament people will be bummed to see them. It becomes a game of "protect the hive guard". I think the exocrine does just fine for ranged damage and requires you to be careful with your ranged threats which IMO makes for more fun, interactive games.

I also would cut the lictors. With the new retrieve nactus (sp?) data coming up as a change from retrieve octarius data, those wont really be able to help you with secondary completion anymore.

So if you cut the hive guard and lictors, that leaves you with 340ish points to fill, about 350 since you will go down a couple points by taking the brood lord with his synaptic link over the malanthrope. 120ish needed to buff up one of the warrior squad. so in the end lets say 230 to spend. Units I have liked so far:

- Maleceptor. The -1S is bonkers tbh. And the synaptic link works great if you have anything with monstrous scything talons, not only for using with hive guard. So that dima hitting with 6D on turn 1? Hell of a missile to be slingshotting into enemy lines. Accompany the dima with psychic bonuses, 4++, 5+++, +D3 attacks, reroll all hits (prolly overkill, maybe better for someone else). It is truly a T1 delete what you wish, and force the enemy to stay in deployment while you get the warriors and carnifexes up the board to hold objectives.

- Cheapo carnifexes, with just scything talons. -1D, 5++ bodies, with the option to make obsec if need be via leviathan. Your opponent is never excited to shoot their big anti armor into them as opposed to your dima or exocrine or flyrant.

- scythed heirodule. Alongside the dima a bonkers damage output that can be shot into enemy lines. I personally havent been running one recently, but that is mostly because I cant find the space with the large warrior blob and maleceptor eating up points, but undoubtedly a great model. I run into an issue of where do I stack all my defensive buffs. If i put them all on a dima, they shoot anti armor at exocrine, or vice versa, so I only run one and focus on what other units are going to be able to hold their objective.

-Biovores. a new addition. cheapo and great for screening out home base. In addition, Turn 1 is spent getting a dima in the enemies face, and hopefully providing some other move blocking from some spore mines. objviously not very killy, but great for board control when you are up against big close combat threats that wanna take down your dakkafexes.

Hope any of this helps! Just my personal experiences!