Interesting. My Trail Graps are E and I run them 25-27 on road. Perfectly worn. Back when I worked at Discount pretty much every BFG Mud Terrain was cupped no matter what PSI they were running. The KO2s seemed to fare better for wear and longevity.
The only ignorance here is buying into the BJ delete crap. As in, they have to be someone IGNORANT enough to not feel the need to change them out when need be - let alone think the delete will last.
I don't have any range/draw experience with a concealable OWB holster but take a look at We The People holsters - good quality and price and what I use for IWB.