Centre of Gravity is almost always the limiting factor in the R22. It's a similar story sightseeing in a 44.
Ours are limited at cabin weight of approximately 385lbs, but some can be as low as 365...
Given you already make up 210lbs of that, you will need a student 155lbs or less (11 stone or 70kgs).
Not necessarily unreasonable, but there are plenty of people learning to fly over that number!