I don’t have personal experience with using the RO filters, but hopefully one of the other guys that has will jump in with some info. I do know that many people went back to using a filter skid, or lenticular filter. The RO filters clog up pretty fast was my understanding.
So Isopropyl is not ethanol. Do you not have access to ethanol? I do know that that our local @Demontrich likes to add dry ice directly to his ethanol in order to chill it before extraction. If you were to do something similar, that would help with getting the temp down.
I would get your ratio of solvent to oil at a 10:1 ratio for your filtration portion, and again chill it from 24-36 hours, and make sure that you are using the right media with right ratios.
Check out this post for some ideas and information: Bucket Tek (Cold Ethanol Extraction on a Budget) - Hash and Stuff / Extraction - Future4200
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