Sorry, but I’ve been down sick for a few days.
When changing the values of the resistors, capacitors or pots in filter circuits, the overall balance of the response changes. The shape of the response curves, the amount of boost and cut and the Fc of each filter can change. If you wish to experiment with the response of each filter, I suggest you build a Tone TwEQ using sockets so you can experiment with the response. This would best be done outside your instrument to facilitate component changes
Here is a good reference for understanding filters: http://sound.whsites.net/dwopa2.htm#s7
You can find excellent concentric pots in a variety if values at: http://smallbear-electronics.mybigcommerce.com/alpha-dual-gang-9mm-pc-mount-dual-concentric/