Heretic of The Seventh Circle
I haven’t played it since the playtest, but I’m fairly familiar. Not a big fan of their dice system, but that’s more about all the “if, then” stuff that triggers off of die rolls, that IME creates a steeper curve before players are playing the game smoothly and without regular interruptions to try and grok the mechanics.Are you familiar with FFG Star Wars?
Numerically, it handles things a lot differently than your system, but the idea of adding or subtracting dice is something that system uses.
But the add and subtracting dice dynamic is solid, IMO.
especially at the lower ends, I like that teamwork can make results possible that wouldn’t otherwise be, by upgrading a no-rank check to a ranked check, or upgrading 1 rank to 2.