Easy solution - loose the pickup! It just gets in the way anyway. Single coils generally need to be closer to the strings than humbuckers. When you lower the pickup level (which is the very first thing I do with any middle single coil guitar), you loose the full energy (not that there is any to begin with) of the the pickup.
It's one of my peaves- sorry. I just don't like middle pickups on Jems. I think I might have used mine on all of my Jems (7 of them) 1 time. Hence the reason for my
custom jem with only humbuckers and a 3-way switch. If I want the 'twangy' strat-ish sound I'll use my strat.
But hey, deep down I'm a Gibson guy, so maybe that's what I'm brainwashed into.
Gabe