tascam 22-2 big bass rise on recording

hi all- its a clean machine- cannot see any wear on heads- im using the recommended tape- big bass rise at 15 ips - 7.7 ips is bass a bit weak and a treble rise- the 15 is the more credible so i just turn the bass down on the amp- i would like to know opinions?
 
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Really depends on what tape you are using, and was deck set up for that tape.
used to do quite a bit of recording with the 22, 32 and 42. If you use a Scotch formulation tape with Ampex bias settings, you will get the phonomena you described.

double check your bias and overbias and see if that solves it.