I had the same experience running a liter and a half in a 22L, I thought the testing lab was fucked cause i distilled it(twice) for HOURS(using the shitty head Elliot discontinued.)
It had a lot of thca in it and it turned into a weird just milk white looking jar wheenver it cooled down, looked like water clear when warm. wish i sent it around more. — 8k watt mantle
Comment may be long overdue and unnecessary but your head could be your bottleneck, not insulating could be so as well. my flask compared to my head has a 15C difference if not insulated. pretty huge if you barely into thcs BP. Bumping your temperatures mad high can increase speeds but there other factors that should be considered before.
I have run a $55 vacuum pump on 5L when my 32 CFM welch needed repairs - 175 micron was the lowest i hit and it seemed to distill at same rate, we signed as a distributor a few years back to resell after the whole “bigger pump - faster speeds” was being pushed on everyone. Ive played with the 8 cfm 16 and 32 on several shortpaths only difference ive noticed is that the 32 cfm gets to the same micron lvl as the 8 in a couple minutes less. A huge system like a wiped film may be different but ive only played with a chinese one so idk