What kind of rig? Your temps should match your feed rate, nothing else. Thermodynamics and heat transfer, brother.
Also, have you checked this thread?
It’s likely that the streaks and cloudiness are due to impurities (heads/tails) making it into your target fraction.
Might as well tack this on as well since I linked that thread, vacuum levels are not as important as a lot of people think. One can achieve >95% TAC with >250mT.