UngeheuerLich
Legend
I don't think you can get exactly those numbers. As I already said: i wish stats were capped at 18. So we had highest down to 10. Then I'd give +1 to all saves. Lets make it only +1 to saves you are not proficient with.Sure. If good was +10, Medium +5, and bad was +0.
But for the medium saves, they can be as low as +2 and as high as +7 then. Really depends on your actual primary stats.
Another idea would be having 1/3 proficiency bonus. That way saves with this bonus would increase at level 5 and level 17. Not very smooth but arriving where you want it. Probably better would be half proficiency bonus -1. For an increase at level 9 and 17. Which would be closer to where I wanted them. This would leave starting spreads alone and get to +1 to +11 as you want.
As I said, I am not totally opposed to changing the bad saves math. I just don't want to call it bug but design choice.Or something like that.
Thanks.Interesting idea.