If you think its your tubes you could try taking the covers off the 12ax7s and lightly tap them ith a pencil to see if they make noise but this can also blow the tube if you do it too hard.
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Sounds like your overdriveing the frontend a little too hard with the distortion.Being as your boosting an already overdriven tube head sounds like the leval on the distortion is too hot.
If you think its your tubes you could try taking the covers off the 12ax7s and lightly tap them ith a pencil to see if they make noise but this can also blow the tube if you do it too hard.
If you think its your tubes you could try taking the covers off the 12ax7s and lightly tap them ith a pencil to see if they make noise but this can also blow the tube if you do it too hard.