I am pick pocketing and every single roll is D20-5 + prof + dex mod. Cant figure out where the -5 is coming from as its linked to the D20 roll itself, not any skills he has..

What is the problem you are solving? Does your proposed change solve the problem? Is your change feasible? What else will be affected by your change? Will your change impact revenue? Does your change align with the goals and strategies of the organizations (Larian, WotC)?