Yes their are 3 replaceable resisters in your Watt under the bottom access panel of the Watt. But I can't image you wanting more treble.. You might have cooked one of the resisters and that's why your tweeter is cut... These are part of the design to prevent you from damaging the tweeters.
Contact you wilson dealer to get another resister pack, you can discuss with wilson what components and whether to change values.
Contact you wilson dealer to get another resister pack, you can discuss with wilson what components and whether to change values.