100 cfm more with anular and downleg boosters can't beat AFR

Rumble, I know the thinner grd straps that you mention. I think that is done to expose more of the flame kernel because the grd strap tends to block flame travel. I think that is the theory behind the E3 plugs. Some are gimmicks, some are not. Projected nose core core plugs were probably labeled a gimmick when they first appeared, & the rest is history....