Most people don't change leadpipes on a horn the do not like. Rarely does it make enough difference. Leadpipes are often matched to the horn. These are merely my humble thoughts.
Save your shekels, and when you have enough, sell the Bach and buy a WB. If you want to go the leadpipe route, consider a Bach leadpipe. A 25LR or a 43 LR might make a big different (see:
http://www.ibowtie.com/tmptleadpipes.html ). I am a big believer in the reverse leadpipe design.
The Bach leadpipes would be fairly easy to get, would make the design concept of your horn and might be a bigger help. Have a good tech install it who knows about mouthpiece gap and will get it in correctly.
But if you don't like your horn, save the money to buy a WB!
Jim