Re: !!!!!!!!!!FRUSTRATED PLEASE HELP!!!!!!!!!!!
The problems you describe can be attributed to the following possiblilities:
Embrochure too tight.
Leak somewhere on the instrument, likely the upper stack. Is it one or a few notes in particular that cause the octave jump?
Poor mouthpiece facing, uneven rails, warped table, etc.
I've never tried a C* opening on Tenor, but i've heard more than one player complain about it being 'too closed' for tenor, wereas it tends to be rather comfortable for many on alto. I play Selmer pieces on Tenor, mostly for concert and classical work, and like the 'E' facing (I have a Metal Classic and a new Soloist).