So i have mixed two batches with a lab mixer, about to mix the 3rd. So I left the K2SO4 out of it the second time and never had any ppt issues. It does produce some ppt when you leave it in the fridge over time, but nothing compared to when i had the K2SO4 in there.
From using a lab mixer, it is a pretty saturated solution, and does struggle a bit when you get to the last ingredient or two. Personally i plan on getting an auto doser at some point and figured in that situation i'd likely double or triple the dH2O and just increase the volume dosed, although this won't necessarily be practical for most folks.