If it's a Vent to Air dump valve they tend to cause all kinds or running issues, Imprezas just dont like them being bolted on. Sounds like you're doing the right thing by putting it all back how it should be, may be worth tracking down a standard re-circ dump valve as well.
If you're going to get it mapped I'd recommend picking up a standard V5/6 ECU and selling the PPP one as they were fetching good money.
PPP ECU should boost to 1.2bar if I remember rightly.
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