Keep seeing A and A+ riders as low down as the 350-520 CAT?
To answer the question, Yes.
Though, normally A riders were not previously sandbaggers (they were as high as they could go), its tends to be previous D/C/B riders who dont want to be promoted or actively try not to be promoted that are the issue.
There will likely need to be a new definition or term associated with it… It will be those who keep tanking their score to get a lower Race Score between winning races.
Those A cat riders are just a product of a poor seed metric.
I’m at A rider with 599.
I have a C category sprint and I always race in the highest category (to test myself) and finish at the back of whatever group I am in.
So, I lose points every race.
If I race in the ‘correct’ category I get to compete against Cat C sprinters with an FTP of 3.3 (Mine is 4.3)