I see your point, Roth. With a good hard heel cake, I probably wouldn't have to waste so much tobacco in my billiard.
My main pipe (a Peterson 317) builds heel cake faster than anywhere else in the bowl, so that in effect, it is a Dublin shape inside. I believe this is because the "system" keeps the tobacco dry, and most of the time I can smoke close to the bottom. I have literally never seen moisture at the bottom of the bowl. The system works for me. This is one reason I love this pipe. It tastes good all the way down.
I was mainly talking about my old workhorse pipe, which is a straight billiard that I smoked for years, and still smoke. With this pipe, all the moisture just condenses on the bottom. Even when I tried packing a bunch of half bowls, to build heel cake, after a week of regular smoking, the heel cake would be gone. I am sure that if I rested the pipe often, it would have time to dry properly. I may try doing that with this pipe for a few months to develop some heel cake. The sides of the pipe have an even .100" or so cake. Just the very bottom has no cake. Since there's nothing there to absorb moisture, the last few bits of tobacco get very moist, and I can immediately taste the steam, at which point, I just dump it. Hence, I don't smoke this pipe nearly as often anymore.
Maybe, I'll try your pipe mud recipe and "fake in" some heel cake!
Truth is, I much prefer a straight pipe (prefer them for ease of cleaning, looks, control of where the smoke goes in my mouth), but my bent Peterson just smokes so good, I've grown to love it.