I was playing around with an outboard preamp with my Fender V Delux and found that the clarity and focus of the B string improved even when I wasn't adding any volume. Is there a good way to tweak the onboard preamp to get a little more push/headroom for the B string? I saw an earlier post about the j-retro unit and I think that one's a little too pricey and a little more radical than I had in mind. It would be nice to just swap out the preamp circuit with something that works better. Any good ideas?