I don't know what kind of music you band is playing but I do a lot of trio gigs and never boost the bass at any time.
When the guitarist stops there are no holes, gaps or spaces to fill. We leave those spaces empty (just bass and drums).
It's called dynamics and dynamics makes the music more interesting for an audience.
If you and the drummer are rocking or grooving well there should be no drop in energy level, which you have to make up for by changing tone, increasing volume or number of notes or anything else, when the guitarist stops playing or does a solo.