Assuming the Plus Program is here to stay, my proposal is to incorporate & rename it in a way that encompasses all monetized channels instead of being a "Program":
• Bronze: 50/50 for fewer than 100 self-paid sub points ("Plus Points")
• Silver: 60/40 for 100-299 self-paid sub points
• Gold: 70/30 for 300+ self-paid sub points.

The naming convention for Plus tiers is a little unclear and apparently not widely known/adopted. According to the FAQ pages, the official names are "Level 1" for 100+ and "Level 2" for 300+, and the below-100 streams are effectively considered non-participants (even though all the factors that define Plus are measurable in all monetized channels). I have never heard streamers use these names, instead either referring to them by the revenue split or re-explaining the entire program every time the topic comes up.

The bronze/silver/gold naming convention is a common "list of three options with an established hierarchy" whereas numbering them leaves the cap ambiguous.

This would, unfortunately, disrupt streamers' ability to use the "PP" abbreviation for this purpose, but ultimately I think it would improve clarity in communication.