The rating system is really too generous. I'm 5k on KGS (and I'm probably lower according to other rating systems), but i can reach 1d here. Also I've submitted 2 problems, and they are rated as 1 dan and 3 kyu at the moment, though i think 10 kyu would be more appropriate. I've tracked the ratings of my problems a bit, and it seems like they are not converging very good.
When I am rated as 1d, and I fail a "1d" problem, it's rating is immediatly adjusted to 2d, so i feel my impact on the problems rating is too large.I don't know how the current system works
, but my suggestion would be to lower the current people and problem ratings (but i don't know by how much...), and to lower the impact of failing/solving a problem on the problems ratings, for example, the effect of a 1d failing a problem that is rated as 1d and has been tried 100 times should be lower than the effect of a 1d failing a problem that is rated as 1d and has been tried 10 times.
I like the rating system of KGS, but that's hard to implement for sure.
...Anyway, thanks for this site