Exactly ketsugo! I picked the 350 over 250 because it did have enanthate blended in. I'm the same way, I like to feel it quick but also know I have the longer acting ester.I was just wondering if it was a specific blend for the 250 and 350 when starting thread. Guess it's up to the brewer. My last sust run was yrs ago, usually make my own but never any blends.