The separating issue is under cooked egg white, to sous vide scrambled egg the temp is 171 or you are not cooking all of the myriad of proteins that make up the egg whites. At 171 if all of the air is out of the cooking pouch (you wont achieve this with a zip bag or external sealer) they will cook in 15-20. Air in the pouch will cause uneven heating so they will take longer to heat all of the way through thus taking longer to cook. from 'At home with sous vide' our cookbook on sous vide available 1st December 2013.