Hello Bogdan1190,
In 6 handed is there a rule when to call with small PP like in fullring?
Not really, not on those stakes. Go-Go for set mining. :>
Although I don't like you line at all on flop. Don't do such hero-calls on board where a lot of draws and even 2 overcards are. Rather just Check/Fold while your plan was to hit for the set.
Best Regards.