The way I'm doing it is different... Since I can only have 8 beneficiaries at max per post, I'm rotating between them.
So maybe in one post @eturnerx (the one who has the most DFTs right now) gets a 8% of the rewards, @taskmaster4450le gets 1% of the rewards and @khaleelkazi gets another 1%...
The other post @master-lamps gets 2% and @tsunsica gets 1% and @ackza gets 1% too.
I can't control how much each post will give out, so whether you get more or less would be random, but it'll even out over time.