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Depends, on a few things
You want the biggest gap your ignition system can support.
The bigger the gap, the bigger the spark, the bigger the spark the bigger the flame front, the bigger the flame front the better the burn, hence, more power.
I'm running stock 0.8mm (0.032 "ish") running 8 psi with stock ignition, I have no issues.
I needed to run 0.6 mm (0.023") on my RB running 25 psi with upgraded splitfire coils.
IMO, first point of call would be to check your coils and wiring before touching your plugs.
Unless your plugs are over 50 k, iridium plugs can last longer, but they do lose efficiency over time.
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