Interesting reading folks. I have an ACG with two MM style pickups but they go into a filter preamp. I have set the neck pickup to have have the filter pretty much open with a hint of boost at the filter 'knee'. The bridge pickup filter is set to be about 25% 'closed' for want of a better word, i.e. less treble coming through and has a little more boost at the 'knee' than the neck seeting. The treble filter is mostly open and then I regulate 'live' with the tone control and blend.
In addition there is a low mid boost on the neck p/up and a high mid boost on the bridge pickup. I tend not to sue these too much in all honesty.
That all makes sense to me, but appreciate some folk may be think what chuffing heck is he wittering on about