pun the thing i was tring to point out when i mentioned that they add some of those chems to r134a to add weight is r290 has compression issues. what i would sugest is that you give it a shot of pure r134 no oil just to add a little weight im talking like 1:6 ratio of r134 to r290 it will bring the boil temp up about 4-5C that way but it will reduce the hell on your comressor so you can run a lower high side preasure
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