guv'nor bass Overdrive Mods

[lowmid]

Hello, I've customised my marshall original guv'nor in order to use is as my main bass OD , So fat i've only changed the input cap, I've been from 9n6 to .1µf (or bigger, don't remember, maybe 1µf) and It was a huge improvement in bass roundness, however, I feel the Eq isnt quite adapted for the bass freqs so Which other caps soulh I change???

I was thinking about doubling C9, c6 c10 c11 c12 c13
any other suggestions??? the key is to have Bass mid trebble adjusted to bass guitar

cheers