Please add animations to add dice rolls from your modifiers and bonuses. It allows the player to feel a sense of progression and accomplishment.
Doing the math for them and subtracting from the DC feels a bit anticlimactic and lackluster. I think you are missing a huge opportunity with your brand and game mechanics by not promoting the idea of character progression and how it interweaves with the dice rolls system. Everyone wants to add to power, not subtract from the enemies power. I understand the difficulties in how this would look for things like stealing etc. But it doesnt have to be for everything, but most certainly - dialogue skill checks!
Thank you.