Ortho clear was not a bad choice but I would be more inclined to use the Cast preset due to the higher temperature. I don't think the choice of Ortho Clear was responsible for any negatives observed though. Non-Plus users could use custom mode 60C for 15min.
I am curious about the type of brush you used to apply CUREgel. Can you point me to an example so I can better understand the brush type? My concern is that possible you are applying the gel too thin. In my experience it has not been a precise application, but rather quite heavy/thick. Apply a generous thickness and experiment with thinner applications once confident with results.
If the model feels slimy there is still gel on it. Try warm water or spend more time rinsing. It should come off and not feel slimy or slippery.
Thanks for the feedback.