i have found that too. I decided to play with hair after buying one more hair that didn't render how I wanted it too. I am learning more all the time and now am buying hair just to work on. Transmaps are getting easier the more I do - I often think  "if only I could paint hair it would make doing transmaps easier" lol but I am getting there slowly

Handle every stressful situation like a dog.
If you can't eat it or play with it,
Pee on it and walk away