I'm not gonna argue the logic of stock pistons failing but please explain warped cylinder sleeves with forged pistons? Why do every other company make iron sleeves for both the H and the B series? Why don't they feel so strongly about the FRM sleeves? Like I said, they aren't ideal for boost and most of them warp after so long. That's why it's best for the F22b bottom end
you are throwing around concepts that it doesnt sound like you understand.

Warped sleeves?

I take it you mean the bore going out of round. That only happens with stock sleeves if the piston is over heated or not tuned properly.

Furthermore, it can happen on IRON sleeves and STOCK SLEEVES with ANY PISTON.

Iron sleeves only mean they can withstand more combustion pressure.

So how many stock h22s have you seen boosted for awhile, then torn down and checked their Piston To wall clearance?

I mean you say they

Like I said, they aren't ideal for boost and most of them warp after so long
YOu must have experience in this area, please enlighten me.

So your argument is:
1) FRM Sleeves are bad because they warp
2) They are weak

Im telling you, you are WRONG.