I don't really like this variant compared to the other two, the points are a little odd compared to them so I rigged it out as a medium LRM mech sort of like a trebuchet. Big engine is to help it back off from the battle line in a hurry to lay on more LRMs. Firing both LRMs together you end up with 36 volleys which I feel is enough for most matches.
I figured with TAG I wouldn't bother with BAP. Guess with BAP you could put back on a medium? This is the odd Griffin out imo, since the other two can run streak boats better.