Thank you for playing. It seems you are happy with most changes.
As for the seals my logic is this:
The negative seals are called negative because they are negative modifiers, not because they deduct PoP. In your screenshot clicking on "Larger Trap Projectiles" would give 1 PoP, but removing "+10% Traps Gold Penalty" deducts 2 PoP. Basically the + and - shows what it is going to happen to your PoP after clicking the button no matter if it's a seal in use or not.
So that's my reasoning. I am open to suggestions on how I can improve it.