11 psi=0.7584233022 bar

I'd leave as-is. Can't go much above that without introducing the possibility of engine harm.
Main problem I have is turbo spoolup. I too am reading 8-8.5 psi turbo output and I'm OK with it for the time being, but the turbo lag is pretty bad. Is it a sign I may need a rebuild i.e. new cartridge or something like that?

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)