It looks like your setup will work fine,the 6 is a horn i have used in the past with good results,some horns are not as altissimo ready,for me.i will warm up daily with harmonics from low c,helping to open my throat,singing low notes,as low as possible,also helps,i cannot bite,i will go through my top lip,i have to depend on my throat.the dog will howl when i practice altissimo,my wife wonders if i am losing it,my children leave,so now i wait for the right time.i live in the woods so at least i have the chance to do altissimo.mouthpieces can make a difference but for me not much of one,but the horn has to be the right one,i have had some tenors that were great playing instruments but did not work well in altissimo,but it looks like you have one of the top three have fun tony