Re: JB (TB-4) too harsh and bold in the same time?
IMO you can always turn down a pot if things get too bright, but a caveat with 1 megs is its tough to get a good, smooth taper; whether linear or log they always seem to have a poor balance for me in actual use.
Further - I have never in actual experience felt that adding 1 meg pots alone could ‘cure’ a guitar or pickup that I felt lacked snap. Might help, but it’s more subtle than I think people realize going into it.