Maybe time for a speaker change and a tune up with your Vibrolux. I have an Alessandro GASC64 in my 1965 Deluxe Reverb and that amp sounds big and full. My 1966 Vibrolux has original Jensen’s. I do sometimes run a Wampler Black ‘65 pedal with my SF and BF Fender amps. The Black ‘65 adds some bottom end and fullness and additional BF tone to all my Fender amps. It just sounds good and is one of my keeper pedals. You need to try a Black ‘65.