Get a wideband afr gauge set up in the car. That will atleast tell you whether or not you are running in the 'safe' zone while on boost.
Innovate has a pretty nice, all in one, wideband and gauage kit on their site. I installed one in my 930 last winter and it has proven invaluable in getting things sorted out. I think they just introduced a slightly cheaper gauge so you may be able to do the whole thing for $250 or so.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
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