Man you can ask all the questions you want. If I dont have an answer, someone will man! I might be crazy, but I’ve pinned E and C, and I feel like ISO was definitely alot smoother. No soreness afterwards either. I am probably going to pin it EOD with Primo that I ordered from GC as well just to pin less volume, but I think if I was doing just ISO i would do 2x a week. I had always read how great ISO was from GC and finally decided to try it.