Finally made myself to make somewhat serious grinding day. Originally I was aiming for 400 games, but did not have enough stamina in the end. At least the fun players were generous and variance was not angry.
I know Spin & Go's are not very much liked here. But if anyone is grinding them anyway - I created a custom PT4 stat to display Spin & Go adjusted EV line. It eliminates the randomness of the prize pool, when calculating your expected winrate.
P.M. me if interested.