strange Boost after O2 sensor install

[Hilton_K]

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installed my new O2 sensors over the weekend and went for a little drive, no more CEL etc so thought all was well

After a few 'spirited' runs I noticed that the boost was acting up a little. Was getting a bigger spike 23PSI under heavy load in 3rd 4th, boost would then hold okay at 18PSI. As the revs went up the boost would become erratic droping to 10-12PSI then back up to 15PSI and tapper off as normal. Also when giving a full boot under heavy load (low revs) in 4th sometimes it would spike drop to 12PSI then back up, when it dropped though you could here the woosh through the intake like the throttle or air was being dumped off
Don't believe this is a fuel pressure issue as I have the APR HPFP, maybe the N75 valve?

I have bluefin logs to email if someone can put them in EXCEL for me and see what all the numbers mean

PM me and I will forward on my logs.

thanks in advance.

mods as below;
Bluefin Stage 2+[]GruppeM & Neuspeed Combined Intake[]Milltek Dump Pipe[]Hawk HP+ Pads[]Forge Catch Can[]APR HPFP[]

[Hilton_K]

well after a 100KM round trip taking it very easy the car has come good! Seems as though the car may have had to relearn some parameters of the new O2 sensors. Hasn't missed beat since :)