Well if you've had an injury you probably need to stretch the ligaments & muscles in the surrounding area. The Trigger Point Therapy Workbook can be downloaded for nowt if you're so inclined, might be worth a look.
Do your feet point outward while you walk? If your feet were the hands of a clock, they should be in the 'twelve noon' or 'five minutes to one o'clock' position. If you're 'ten minutes to two' like me, you're almost guaranteed to have leg, knee & lower back problems.
According to
http://cycle-ergo.com/the knee bend for the 96-01 TDM850 is 80 degrees while the Fzs600 is 74 degrees (smaller number means more bent). More foam in the Fazer seat & those low pegs on fleabay might get you to 80 degrees
Personally I loved my TDM but I know they are a bit Marmite. With suspension upgrades they stay with anything on a tight back road, but they
are a good 10 ponies down on the FZS
You're right, miles are too high on that one, particularly for the price. I'd track down a 30000 miler