I find that rank swings are too huge with only 4-5 games for me to up rank or drop.
Plus I play modified blitz (Selected Live setting with x2/3 20/30 seconds byoyomi) too. So i assume it should hold less weight? Or is it only for board sizes that hold less weight?
I actually like that about ogs. I think IGS uses a similar system, but with more games needed for rank changes and ranking up when your rank is outdated gets very annoying. Same with KGS.
I think all speeds have the same weight, but it might be a good idea to give less weight to blitz.
The moderators said in another post that 13x13 and 9x9 weighs less in a ranked game than 19x19. I couldn’t remember anything about different game types, however.