X-rays reveal that these large bass mouthpieces are extremely thin in the upper cup wall near the rim which I feel contributes to a lack of depth in the sound. So you were looking for a mouthpiece design to combat those problems. The rim of the mouthpiece is semi-flat which allows me to have good endurance after playing a long time in any register. We experimented with various throat sizes and came up with an 8mm throat which seemed perfectly suited for both orchestral and solo playing, while allowing enough bite when playing jazz or commercial work. It was important to have a mouthpiece that didn't compromise in one particular area.
Some mouthpieces sound great in loud playing but suffer in softer dynamics.
I also had some thoughts about the overall length of the mouthpiece. It seemed to me that many currently available bass trombone mouthpieces suffered greatly in the upper register which I suspected had to do with the fact that they were simply too long. Finally, while there is a trend among some players and manufacturers to make bass trombone mouthpieces that are beginning to resemble tuba mouthpieces, I was interested in developing a mouthpiece that would preserve the bass trombone's unique sound and role in ensembles. I've been around long enough to know that many people who play on overly large mouthpieces often run into physical playing problems years down the road, so it was important to make something that would help insure longevity and not cause harm to a player. I think we succeeded in all these areas.