On my 3rd set of Spark Plugs

[Austrian Dodge]

I'm using NKG BPR6ES right now, and i'm on my 3rd set now within the last 2000km's.
They're gapped to 0.7mm and are colored like they should be (nice brown, no debris) - although i'm still running way too rich up top (AFR 9.9:1 @ 5500rpms)
The more boost i'm running the more it's missfiring. Right now it's on 16PSI boost.

This is an individual coil setup (LS1 coils) with 5ms dwell time, custom made ignition wires (8.8mm wire, MSD coil boots and accel spark plug boots).
Is there any better spark plug option for our cars? A friend of mine suggested BKR7E-11 or something like that.

I guess my NKG's are too weak for those coils.

Let me know what you guys think, i'm running out of ideas.

[IceMat]

Have you used champion N2C? I have in my shadow a blaster 3 coil, msd6a, and 8.5 magnecor wires. I have them gapped to .050"

If you like to use NGK, use B9ES.

[turbovanman²]

Yep, they just can't take the energy of the coils, try Iridium, It should be a BR6EIX.

I have an Aurora coil, I would kill stock type plugs in under 5K, switched to Iriduiums and I can get 20K out of them without a mark.