Glad you've got it running, looks like quite the journey.
A bov shouldn't increase spool times that's really odd that you've noticed that especially at a "drastic increase" if anything a bpv is supposed to have increased spool times after shift due to recirc air.
Sounds like the bov you had was not tuned (appropriate spring) at all for your car, because there's nothing really you need to ECU tune wise for your car to run one just ensure appropriate spring
This video explains it all
A bov shouldn't increase spool times that's really odd that you've noticed that especially at a "drastic increase" if anything a bpv is supposed to have increased spool times after shift due to recirc air.
Sounds like the bov you had was not tuned (appropriate spring) at all for your car, because there's nothing really you need to ECU tune wise for your car to run one just ensure appropriate spring
This video explains it all
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