what kind of selection does your local music store have for mouthpieces? are you close to some place that would have alot to choose from? and are you doing all of this on B flat?
The way you describe Bach mouthpieces is very similar to how I would describe them, good sound but I miss a lot notes on them. I find that Laskey mouthpieces help me with this and I have a much less chance of spleeaahhs or cracks with Laskey. I would say either email Scott or try to find a local dealer and see if they work for you.
www.laskey.com/
Hope this helps.