Yikes. These pumps are meant for their butane ffe. I was going to get one but it sounds like a nightmare. Hopefully it will do better at warm temps. I imagine they will be fed cold butane by many people… At least on the first loop of the ffe the butane could be super cold. My advice to the butane crowd would be to let the solution preheat in the vessel before cycling.
Anyways… You’re on the right track with the mag drive pump. Read "cold ethanol pumps " thread there is plenty of discussion on your options.