Overdrive literally blurs the notes, making them less sharp sounding, so adding in highs/high-mids is def the way to go. I`ve found that when I get to a point where I think the bass is too toppy/middy on-stage, or nearby when I`m rehearsing, that is the sound that will be right, out front in the audience. The frequencies you`ve boosted should have been ideal for what was wanted, maybe boost them a bit more, or up the mid-freq to say 2.5khz or even 3khz.