To reduce the bump in volume, you could get a 50k trimmer potentiometer and put it between the connection of the green and brown wires. That’s where the original 50k volume control goes. I haven tried it but I would think a little resistance there would lessen the initial volume bump when you engage it. I don’t know what to think about the TBX. I like the one I have but I know what you mean by the short range and difficulty dialling it in. I wonder is a standard tone control would give you more useful range. A dual concentric pot would be cool for bass on one and treble on the other but it would definitely change the aesthetic. It might work with a mat black pick guard and black Telecaster style knobs but it wouldn’t ever match Strat knobs.