You ARE mad. Totally mad. LOL
I have SP Mk 25 EVO+G260. They were the best breathing regs I'd tried. They are still tied for best. But, I got an Atomic Z2 set for single tank and and M1 set for doubles and - to ME - they breathe equally nicely to my SP regs (which I still have and keep as backups for doubles).
I took my M1s to 300' on TX10/50 - yielding questionable gas density. I'm not recommending it and I won't do it again. I'm reporting the facts. Then my buddy got entangled in line (at 300'). It was exciting. Even with all that going on, I felt like my M1s breathed perfectly fine.