thanks for the advice phil and badger.
i tried a bass roll off with various series capacitors of different values. tim's definately right that its not that easy to find a satisfying value, but by trying a few values i got something ok. the problem is the filter has 1st order characteristics and the roll off is not very tight so its harder to find the right sweet spot.
the 1M pots not having arrived yet (only ordered them yesterday!) i simply tried removing the tone control from the bridge pickup. not exactly the same, but should have a similar effect. in the end i prefered this way of brightening the tone. it could be nice to brighten it some more, perhaps... i'll try 1M pots and no bridge tone control when they arrive.
seems as if i prefer my high output pickups to be what some would consider to be very bright sounding... they appear fine to my ears though. hmm... wish i could try some other forum members axes with my rig.