Miss-fire after increasing the boost. Solution?

[RocketOgre]

I recently fixed a long-standing wastegate issue with my GT2871R. The HKS actuator was letting the flap open no matter the signal from the vacuum line. I got a Forged actuator and I couldn't be happier. So I just went from 12psi to 19psi and have fallen in love with my motor all over again. One problem I'm getting occasional miss-fires under full-throttle only after hitting boost, usually if I start the pull at a low rpm.

I've got a JWT ECU so she runs a bit rich, AFC neo is in the works. I've got a stone stock ignition system heat range 7 NGKs and all the NGKs are probably 10k miles old. My question is this: Do I need an ignition amplifier at that boost range or should a new set of plugs fix the problem? Could how rich the JWT let's it run have something to do with it?

[Grenade180sx]

re gap the plugs down lower to .28 or so and try it again, it wouldnt hurt to change the plugs but a regap should fix the issue

[RocketOgre]

Gapped them down and the problem is fixed, thank you sir.

[Croustibat]

You need a remap too. Smaller gap is mandatory, but going from 12 to 19 psi without remapping is dangerous (and i mean it, no AFR piggyback shit here, if you dont want to melt your pistons you need to pull timing)

[RocketOgre]

You need a remap too. Smaller gap is mandatory, but going from 12 to 19 psi without remapping is dangerous (and i mean it, no AFR piggyback shit here, if you dont want to melt your pistons you need to pull timing)

Which part of my post makes you think I'd have heavily advanced timing? Also melting pistons would involve going lean, I'm running rich and my only real danger would be detonation, which shatters pistons.