JVICAMPS6 - I really think you are talking about two separate issues. I have a slight vibration in the top feel of the clutch pedal. Never worried about it. Unless it is severe, I doubt it is a major issue like block internals, more like precession of the throw-out bearing.
I also have an occasional issue with a sharp cut when on boost from low engine speeds and when lifting off throttle for shifts or when progress is balked. It's better managed by keeping rpm up and running the boost off gradually by gentle throttle lift before shifting. I haven't fully resolved it yet. It doesn't occur when in full cry, when the engine is handling all the boosted air, and is generally worse in traffic light situations. I'll be interested to discuss this more with in case we have a common issue. Mine only started when I fitted the FMIC. I think the long plumbing runs are part of the issue.
As an aside, I do think that 18psi is a bit much. It certainly seems to be a maximum for this turbo. More than this and you generate more heat than usefulness. I run a max of 17.5, but have my SB staged up to it.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18