Player rating for tournaments across all installments of Heroes.

- What is the aging rate?
- What is the adjustment ratio? 1/3 is too much, in my opinion... let's make it 1/10... it will reduce the rating of an inactive player by almost the entire amount over a year, but it won't be as painful for a missed tournament.

I still think you misunderstood the rating aging system.
I used to play VGAPlanets - there were 11 people participating in a game, and this formula still works there; I'll send it to you tomorrow.
The thing is, there used to be a lot of hosts for the game, but there was a coordinator who all the hostmasters sent the results of the games on their hosts to, and he kept the rating. There were probably a thousand people in the table. They sent the results of the games to the host. He looked up the players in his table. Then he reduced their old rating by 1/3 and added their new rating earned in the game. It turned out that if a player took 1st place once and last place another time, the 1/3 reduction would cause them to drop sharply in their current rating, which is correct.
I have the method for this calculation somewhere. But it's specific in that no more than 11 people could participate in a game (tournament). And I don't know how he filtered and removed those who stopped playing. On this resource, it's not yet clear who is a regular player and who is not. With this system, if someone who plays constantly has their rating reduced by 1/3 each time, they may drop in the ranking, while a newcomer will hang around in the top spot without playing. That's why I suggested aging the ratings for everyone, but we need to decide on the timeframe. I know - I suggested a 2-month grace period, VDV published - 1 month.
Yes, it's probably right to gradually reduce the ratings for everyone. Since we're doing this for everyone with a one-month grace period, let's go with 1/10.
Just talk to VDV about this yourself. I'll support it, but only VDV knows what will happen :)