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When the HPFP is doing that big dip below target, the AFR is quite rich (less than 11:1) and when the pressure get close to target is leans out a bit. Maybe the air/fuel mixture isn't getting burned and its dumping the raw mixture on the o2 causing it to measure rich?
I am currently having the same issue on my car with 3 different OTS maps in bootmod3 but stock map runs fine. Could you try logging your spark dwell time? I've noticed a big correlation between coil dwell times less than .5msec and a bad missfire/stutter. Stock dwell times rarely ever go below .5msec.
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