What... Me?... Never...
Okay, time to put my 2.2 New Zealand cents in...
Not many individuals go from a highflow turbo back to a stock turbo and say they prefer it, so this is quite foreign to most and probably the cause of much angst.
Saying you didn't even make 7psi until high up in the rev-range is saying that the setup you had was not ideal, whether it be your tune, boost controller gain etc...
I could go on, but I'm sure it'll just be echoing what others have already said