I've had my green up to 30 psi and 9000RPM on BR8ES plugs, stock gap of 0.028", stock NGK wires, stock coil packs. I've never had a misfire. No reason to close up that gap if you don't need to, and you really shouldn't need to until you are cranking out some serious power. If you're getting misfires that AREN'T at higher loads, closing the gap won't help.

It should be mentioned that those psi to heat range numbers are accurate for 16G sized turbos.