I tried to apply the advice that UberHuberMan gave me in the last post and I'm removing more wood from the juncture of bowl and shank. Anyway, i think I need to improve this part a lot.
I also bought a metal lathe, but I'm still learning how to use it. Anyway, each one of these pipes are teaching me a lot. I'm happy because I'm not satisfied with the result yet, and it's far from the results of most of the people in this forum, but I see a little improvement in every pipe. It makes me happy.
11th pipe:

12th pipe:


13th pipe (first one using the lathe):

14th pipe:

I think that an interesting next step would be to buy sandblasting equipment. Any advice on specs? I never didn't and I don't know anything about it. Don't tell me brands... I'm in Europe and I realized that most of the brands you talk about, here are very hard to find. I would like to know how big the compressor should be, etc.
Thank you!!