well i did the course and still had problems with removal on some colours on some nails. I found that Salon Systems weren't much help tbh but they are aware of it. One of the girls on the course was wearing gellux and even the trainer had a problem removing hers.
I've done a bit of trial and error on myself and friends/family for removal and seem to have found an answer that works for me. I've had problems with the very dark pigment colours but now find that if I apply heat after they're wrapped, I use a wheat pack on top of the fingers, it comes away as it should a little quicker than the time recommended.
I'm continuing to try that method and if I get success across all colours that have been a problem then I'll let Salon Systems know and maybe they can offer it as advice. I have to be honest and say they phoned me after I posted on their facebook and have been really lovely, if a little vague!
Hope that helps
Tracy