Peanut gallery: My partner owns a sweet L3301 and has run equip for 40 years, I know, it gets better.....He runs his tractor at 1300 rpm nearly all the time because " Thats the way we did it in the day" After a handful of times regenerating in 200 hours, we convinced him to just try running at 1800-2000 just for SAG. He's now gone 97 hours with no regeneration. He swears it's witch craft. Maybe that'll help. Keep the shiny side up.