So basically... once you really cap crafts, you have to be careful when crafting with your sub crafts? That's pretty wild, and I never thought o that.
When you hit the end of that specific 10 level range your on you have to trade item to advance further. If you never trade that item in, you dont ever have to worry about it going up.
So if all your sub crafts are lvl 70 and you never trade in a test item, theirs no risk (skilling) in trying a recipie that might be slightly higher