I thing its a bit overpowered... not in point costs, but its hard to impossible to beat it on the battlefield. Although your opponent will be able to field 4-5 additional activations, the firepower is more or less enough to wipe out one formation per turn and it really doesn´t matter if it is just IG Infantry or a Warlord Titan

You should make sure, that your opponent fields a super heavy titan as well... otherwise the game won´t be much fun... promised

btw... a funny list, i tried out once Nine Activations on 3K including an Imperator and AA:
EMPEROR TITAN [1250]
Imperator Configuration
REAVER TITAN [650]
3 Turbolaser Destructor
WARHOUND TITAN [275]
Vulcan Megabolter, Plasma Blastgun
WARHOUND TITAN [275]
Vulcan Megabolter, Plasma Blastgun
RECON PLATOON [100]
4 Sentinels
RECON PLATOON [100]
4 Sentinels
SKITARII DEMI-CENTURY [100]
THUNDERBOLT FIGHTERS [150]
2 Thunderbolts
RECON PLATOON [100]
4 Sentinels