754s might help, but as they have slightly more sweep they may end up aggravating your forearms instead.
Ask yourself whether you are after more height the risers or some handlebar 'pullback'?From memory, the R1 front-end involves more weight over the front-end than standard, mostly because the forks are shorter. I think that would automatically place more pressure on your shoulder. You can buy riser inserts between 20 and 30mm, although the 30mm version might be too long for the standard brakelines.
Risers that point back towards the rider are easier to reach, so less weight on your shouldesr. The trade-off is that your body weight would be further back from the front-end. I used Virago 250(!) risers on mine.
Take a look on cycle-ergo.com and select the 2001-05 FZ1 (it's an American site). Then enter your height & leg length. After that, experiment with the 'Vehicle Customisation' options, specifically handlebar rise and pullback. You're aiming to reduce the forward lean angle
