Sounds great to me! I've made it up to level 12 and while the benefit of being able to compose two potions at a time is great, the amount of xp needed to gain an additional level is so much more. It is daunting to think of the amount of time or gold or both that is needed to reach even level 20.
I realize there are players that have far surpassed level 20, and they have my sincere and heartfelt congratulations. But a tweak on composing would be nice so they can advance even farther and more of us can attain sufficient experience to make some of the truly neat potions we know will be available with those advanced levels.