i use 8000c's on my greys platinum and nitra, the reels have a small reel seat and just need that little bit extra weight on when tightening up on the sliding seat,
if you have a spare reel seat or take the seat off your reel, get some small diameter, electricians shrink tube, about 12mm will do, slip it on and cut it over length about 5mm, warm it with a blow torch or over the gas ring, watch the tube until it just starts to grip the seat, take off the heat and cool it, then trim the excess back to the edge of the seat. take it off and repeat to do as many as you feel necessary. just slip a pair on your reel seat when your tackling up, make some spares coz you might tend to forget and loose a one. quick easy and cheap fix and does the biz when your lookin for some extra weight against the sliding seat.