Fazer 1000

I have a Fazer 1000 (2002 model, approx 14,000 mile). Unfortunately of late it seems to have a developed a slightly sloppy gear change, with it failing to select gears smoothly usually when changing down, or when attempting to find Neutral. I've tried re-adjusting the clutch cable right to it's workable limit, and the drive chain tension seems correct. I did find I had some how overfilled the engine by about 3/4 Litre of oil, but this excess oil has now been removed, and the issue does seem slightly less. When accelerating hard from a stand still there appears to be no issue, no clutch slippage or missed gears. I don't wish to part with the bike, as I enjoy riding so much, so would welcome any thoughts and suggestions as to what to problem may be?