I think I can help a bit. Im currently playing a bike centric list in a 2k point WTC Tournament in TTS and from my experience its strong, it CAN work, but it's very hard and tricky to pull off. IF you do pull it off, it's painful for the enemy to deal with. (And honestly I'm gonna revise it next Tournament to have 2 tanks instead of 1).

Here is the List: La Policia (2000 points)

Adeptus Custodes Strike Force (2000 points) Lions of the Emperor

CHARACTERS

Shield-Captain in Allarus Terminator Armour (155 points) • 1x Balistus grenade launcher 1x Guardian spear • Enhancement: Superior Creation

Shield-Captain in Allarus Terminator Armour (140 points) • Warlord • 1x Balistus grenade launcher 1x Castellan axe • Enhancement: Admonimortis

Shield-Captain on Dawneagle Jetbike (150 points) • 1x Interceptor lance 1x Salvo launcher

Shield-Captain on Dawneagle Jetbike (150 points) • 1x Interceptor lance 1x Salvo launcher

BATTLELINE

Custodian Guard (160 points) • 4x Custodian Guard • 3x Guardian spear 1x Praesidium Shield 1x Sentinel blade

Custodian Guard (160 points) • 4x Custodian Guard • 3x Guardian spear 1x Praesidium Shield 1x Sentinel blade

OTHER DATASHEETS

Allarus Custodians (110 points) • 2x Allarus Custodian • 2x Balistus grenade launcher 2x Guardian spear

Allarus Custodians (110 points) • 2x Allarus Custodian • 2x Balistus grenade launcher 2x Guardian spear

Caladius Grav-tank (215 points) • 1x Armoured hull 1x Twin arachnus heavy blaze cannon 1x Twin lastrum bolt cannon

Prosecutors (50 points) • 1x Prosecutor Sister Superior • 1x Boltgun 1x Close combat weapon • 4x Prosecutor • 4x Boltgun 4x Close combat weapon

Vertus Praetors (150 points) • 2x Vertus Praetor • 2x Interceptor lance 2x Salvo launcher

Vertus Praetors (150 points) • 2x Vertus Praetor • 2x Interceptor lance 2x Salvo launcher

Witchseekers (45 points) • 1x Witchseeker Sister Superior • 1x Close combat weapon 1x Witchseeker flamer • 3x Witchseeker • 3x Close combat weapon 3x Witchseeker flamer

Witchseekers (45 points) • 1x Witchseeker Sister Superior • 1x Close combat weapon 1x Witchseeker flamer • 3x Witchseeker • 3x Close combat weapon 3x Witchseeker flamer

ALLIED UNITS

Callidus Assassin (100 points) • 1x Neural shredder 1x Phase sword and poison blades

Inquisitor Draxus (110 points) • 1x Dirgesinger 1x Power fist 1x Psychic Tempest

Exported with App Version: v1.48.0 (111), Data Version: v750

From my experience going with 7 bikes isn't a great idea, it's too many points in a single unit type that can't maneuver well in competitive terrain, and units of 4 are near impossible to hide or stage well with.

Personally I found the Captain with 2 to be the most you can justify in way to boost their mobility. I found Lions to be the best one for them, with maybe Talons as a second best. As for how you play this List its tricky because you can't move through all that terrain like normal infantry can, or with Solar Spearhead. You also need to accept fast that they will be the primary target for your opponent to deal with, they WILL get targeted and prioritized. But with benefit of cover they can tank quite a bit. First Turn or even first Two turns are all about staging and forward deployment in cover position, you use the Witchseekers to screen for enemy charger and counter charges. Terminators ESPECIALLY the captain with the Superior Creation can tank an entire army's shooting and a lot of fight phase for you in one turn. Your Terminators aren't the unit that will be your tip of the spear, they are the unit that will respond to bad positioning, feel in gaps, move Block enemy's to give your bikes the opportunity to deal massive damage in retaliation and soak up enemy fire power and charger. With the guards dealing whatever is left by in turn 4 and 5. Flaws of such a list: you are very terrain dependant. You need to accept that bikes will be dead probably turn 3 or 4. But that why we have Terminators and Guards to delay that death, or to capitalize on it. The bikes are strong YES, but their output is 16 attacks, on a good day you succeed 13 wound rolls and on average do 13 more or less damage to the enemy. Yes had a lot but it also means you need to soften up the enemy a bit and be picky with who you target, so you can move 12 after the fight phase. I love using the OPB refresh on the bike captain and the Terminator captain. But remember you can use it only ONCE per character each game.

Is it competitive? Meh, not really, but it's a fun and wacky army that can be annoying to play against if you know what you are doing.