I bet you have some bad caps in the body...JW replaces all that...keep in mind the mics work and he replaces most of the active parts so good chance you can get back in the saddle....talk to jw and let him know that they are ~10db off and want to know if after his mod that they will be closer....bet they will.
another thing, if you are using a preamp and you do not have any sonic response difference (meaning both mics resopnd to the same freq the same just one is lineraly 10db lower than using the preamp is an option to re-gain 10db. BUt I'd talk to JW...call him as he is not very responsive to E's.
gfl
jah