i currently play a jet tone dsa piece. think its a copy of docs piece when he played it back in the day. anyway its basically a 7c size piece with a really flat rim with a sharp inside edge which i really like. qestion is that i have some trouble playing in the low register. its iffy at best on a low g unless i stop playing and just play it. not reliable say on a trumpet solo that goes down there. i have drilled the throat out to 22 which helped a little. i have played on a bigger piece that does help get down there. a bach 1 with a 22 throat. but it limits my endurance. could never play it on a gig. i play 3 & 4 hour gigs in a rock band & play well above high c all nite long. i dont think its a piece problem since i have probably owned 50 different pieces. the big ones work low but there goes the endurance. range is there on wutever i play on. i would like to be one of those players that can play from the bottom to the top of the horn consistently. maybe i need to play on 2 or 3 different size pieces. although i dont like that idea. the best players dont switch back and forth. they play on one piece for everything and can play pedals and double c. any advice?