I have the BR7EF. They have the v groove. NAPA has them.
The BR7EFS has a solid electrode and NAPA has to special order those usually.
I checked mine today and they have a .34 gap with not problems at 19PSI.
I always run the biggest gap I can.
i was trying to run more than 20psi lol! Correct me if I'm wrong, but wouldnt I have more cylynder pressure than you? I also am running rich tune, 11.0 all the way to redline.