Yea they are a bitch to learn but once you start getting them they will become easy. Try different foot positions. Whenever i have periods where i can't do tres (they are really reaally annoying) its usually just because i forgot my usual foot placement so it wont flip all the way.If it goes too much left dont try scooping as much and if its to the right scoop the board in front of you so it makes a backwards L. You'll get it sooner or later though. Theres a few tricks i thought i'd never learn like bs tails and a few other ones but i eventually got them it just takes time. It took me about a year to get my tres good and thats after i could do them somewhat consistent. Its been about 2-3 years since i learned them and now i have them about every try. It might even be as simple as you just arent committing. I could try to make a tricktip for you tomorrow if i go to my friends or if i don't i can make a shitty one at home.