I apologize for the mess!
In fact, I also wrote for clarinets. I suppose many people write straight in transposed pitch. But I'm not that professional...
I know it's very important for players to write in transposition, but it's easier (for me) to compose in concert pith and transpose when finished).
Anyway, your piece is fine and beautiful. I don't think one must follow strictly the "rules" of dodecaphony or whatever. I see atonalism as a tool and I use it in many ways: nearly tonal, totally atonal...
The fact is that if this is an exercise on atonalism, perhaps you are asked to treat the score more in the style. Otherwise, it is good... Greetings!