I have been using .028" with the MSD Blaster and Trifecta tune with copper plugs for several months. No blowout at all throughout the entire range. Before, I was getting nasty blowout at any gap above .025".
Mine are gapped at .32 w/ the BKR7E's. All stock, besides the coil pack, & no tune. Have about 800 miles on the coil pack and I can feel a very slight stutter in rpms while going uphill around 2200-3300rpm. Probably gonna go down to .30 on gap this weekend.
I'm putting in the 7E's with a bnr tune this weekend curious to see what the stock plugs check after they are pulled. I've had 0 issues but I also drive mainly below 3k 99% of the time. FYI .028 is listed as factory gap on most auto parts websites when you go buy plugs. I'm going with .025 measured with precision shim stock.