I'm not sure I agree with the seemingly arbitrary 2% hit to diamond but you're putting some decent numbers out and I think we're largely on the same page. The lifeblood of the game is from Silver-Diamond, the rest are outliers. Call them whales on one end and people without sufficient skin in the game on the other, either way, they aren't the core of the ecosystem.
Fully agree with the PS....
Exactly this. My percentages might not be perfect but as you said, the point is to reward those who make up the core of the game.
There will always be ways to reward the top 100 players through chests, tournaments, sponsorships, and whatever else they can think of but SPS is supposed to be about giving the players ownership in the direction of the game, not just the whales and bot farms.