from what im seeing in your lists of mods, you have no upgraded intercooler and that my firend will be the the problem .. it,s too restrictive and upping the boost will not be that good..
i haven't heard anything bad with those two ebc's but another option is the Apexi AVC-R, i have it and it is awesome, boost by gear, boost by RPM, it's great BUT it doesn't read in psi, it reads in bar, for me it's not a problem at all cause i have boost gauge to check what the psi is
I used a few different how to's for the install, I found one for a turbo timer with the proper wires to tap and another for a boost gauge showing the vacuum source.