Crossovers, three turns, Mohawks, and simple basic stroking are "lifetime learning" skills in figure skating. Basically you learn these skills early and you want to get the mechanics right in the early days so your foundation is strong but you will forever be refining and improving them. If you were expected to do these skills "perfectly" (I use this word lightly because in skating, there is no such thing as perfectly) from the get go, the passing averages from pre-preliminary to senior would be the same instead of pass/retry, 2.5, 2.7, 3.0, 3.2, 3.5, 4.0, 4.5 and the passing performance level expectation would be the same. At an early learning stage, you have to face the facts that you aren't going to skate like Patrick Chan or Carolina Kostner (these two, IMO, are the best current eligible rank skaters in terms of pure skating skills). There's an ease and flow that comes with hours clocked working on the ice that can't be short cut. I was reminded of this yesterday by one of our Prebronze skaters when she asked how long I'd been skating and admired the ease with which I skate (in comparison). My advice? Stop obsessing about it and just let it happen naturally, it's not like your crossovers are mechanically wrong or that they're below expectation for your level. One of the things I've found is that obsessing about something in skating NEVER helps improve it, but when you back off on thinking, focus on doing what your coach says, that is when you start to take steps forward.