I didn't think to change the tone pots... I'm very happy with the new pickups though, I'd be surprised if I could get more treble out of them!
It's certainly not as bad as I remembered it! I think I was unconsciously trying to come up with reasons to dislike it as I had a chance to sell it, and the lure of cold hard cash is hard to ignore! Having played it again I realised it is certainly odd, and very different to all other basses, but not 'uncomfortable'.
But that's the Rick - a jumble of oddball ingredients that probably shouldn't work, but combined makes the most incredible sound.
With these new pickups, it's finally giving me 'that' tone that I've always wanted from a Rickenbacker. CLANK. I HIGHLY recommend them!