Preferred Solvents/Blends for CLS

Curious as to what all you guys on here think about different LPG blends and solvents; n-butane, propane, isobutane, or any blend of the three together. What form of product consistency are you going for when using certain solvents/blends? We use Gas Innovations and we’re normally running n-butane and propane, anywhere from 90/10 - 60/40. Not really sure what I prefer yet. We haven’t tried using pure isobutane yet, I’ve heard lots of different opinions on that. Trying pure n-butane but we run an injection coil at -60f, and it seemed to maybe cause some issues. What are you guys using and liking most out there???