Okay -- Here's the next issue to check
You can get your pedal and the M/C pushrod OVER CENTER -- in other words -- Over 90*.... this will cause the piston to actually pull back - dropping the pressure off. Not a good explanation --- but basically --- put someone in the car and push HARD on the pedal -- have someone else see where the pushrod and pedal are. More than 90* and you have problems. Fix that if that's the issue and see if it still persists.
If it's not that --- then I'm stumped. Since you're having the SAME issue with two different parts -- I'm not going to blame the parts... it's got to be (well it doesn't have to be but you know what I'm saying here) somewhere in the install/system. Doubtful two different parts will give you the very same issue.
Todd (Vegas69) is an expert on pad knockback -- and that might be the issue as well --- but I can't tell you how to fix that as it's an individual car / setup / how hard you're driving etc. But he has quite a bit of information on this in his build thread - "Project Payback".
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