You would be crazy to think about that sort of power level from any self contained rifle other than the Theoben Eliminator. I run my HW80 .22-which is a much better rifle for FAC -at 20 ft lb and it is VERY smooth.

As for the involvement of Hull Cartridge, remember that the HW90 is a joint venture between HW and Theoben and any maintenance would probably involve the gas ram so is better carried out by Theoben or Theoben experts anyway.
If you want a FAC self contained rifle then your best bet is either the Eliminator or the HW80.

Why is it that people seem to feel the need to exaggerate power outputs?? Just daft.