Yes the head does help, as well as just replacing the intake pipe. The problem lies as follows:
the air comes in here ->
Normally an intake pipe is the same diameter all the way through. The A55 ones are like this though. See how the hole is one size, then gets bigger, then smaller, then big again, then smaller, and yet smaller? Shaun has just been cutting something on the stock tube to help. But the upgrade kit has helped fix the bugs on the running bikes and Tomos is having the dealers install them on the unsold bikes also.