You need new coil packs. I run IK27s 0.030 gap on 74-GTS on AEM & DLI @ 28psi with no miss.the 6097 and 3330's are the optimal plug to run in BPU to small APU Supras. (Heat range of 7, one colder then stock.) The amount of gap you run is determined by your boost level, engine managment, and ignition amplification. I run the 6097's because I can't get 3330's locally.
On stock ECU I ran 6097's gapped to .021 to not blow out spark.
Now with AEM, requires a HKS DLI ignition amp if you want to run past 16 psi due to wasted spark. I have the plugs gapped from .022 - .024" Cheap plugs are still the best.
From what I see if you don't plan to run above 30 psi (upto 76-GTS) stick with Iridiums, you don't have to constantly change them and they last. The Denso Iridium IK24s and the NGK Iridium 8s are very good choices.The Iridiums are different. You don't want to gap them due to damaging the electrode. Is this at all boost levels?