Hey Paul and Kyle,
thank you for your answers.
I first off tried Kyles attempt last night...did't go soooo well

I basicially managed to fill all the holes i saw from the outside and put a bit more wax just where it connects to the didge....
Then i shaped the opening a bit smaller and rounder.
This had a massive influence on the sound and crsipyness of the sound...it is not as loud anymore and not as crisp and seems to have some kind of side tone to it.... hard to describe really.
But that makes really clear how much influence just the mouthpiece has. I will probably trying to make it completely new.
How thick should i roll the wax and is it important that it is nice and smooth from the inside?
Also i am not sure how "sharp" small the radius at the top should be. So by that i dont mean the diameter but the thickness off the wax at the top i guess...and should that top bit face more inside or outside? So should the very top bit be like a cone or rather facing a bit inwards?
Maybe i am just a bit too detailed about that, but i just saw how much influence these little changes i made last night have on the sound.
Thank you so much for all your help, I really appriciate it!!!
Ciao,
Adan