^this, your tuner sounds like a muppet. you want to run the biggest gap you can without getting any spark blow out, so if its not missing under load 1.1 is fine, most standard cars with old coilpacks will blow out at 1.1 with higher than standard boost, but that doesnt mean you should run a smaller gap on all cars regardless of condition.
6's are fine, they're still 1 heat range colder than standard, 7's will simply not last as long for no gain whatsoever in your case.
the only difference between the bcp and bk is the v groove tip and depth, fairly minor differences and both will work fine.