Since you have an early bike, if there hasn't been much or any servicing of the front forks there is likely to be a degree of wear in them so this will add so the difficulty of low speed handling. The GW does suffer from some flexing in the front end which hinders slow manoeuvring to some extent. If the forks are good, you'll likely find that a fork brace will provide a noticeable improvement. As a riding tip, be positive about your turns and don't take them too slowly. Apply throttle and use the clutch for speed control. Also, many of us find slow speed in second gear to be smoother than using first gear and, personally, I apply a fair amount of rear brake too which stabilises the bike.
Most bikes fall in as you instigate a turn and you do have to hold back the bars to prevent it being excessive. Left turns may be easier than right turns because your throttle hand tends to accelerate the bike in that direction, when right turning you'll need to deliberately crank your wrist back to keep pressure on the throttle, especially so on a tight, slow turn - applying power helps hold the bike up.