What if you carb rotate, and keep your starchy carbs slightly higher to fuel your workouts 3-4 days a week, then after your postworkout dex, go zero carb the rest of the night?
For example, when I'm cutting, protein and fat are constant. Carbs are around 150 on training days, and 50 on non-training days. Those 150 on training days are almost entirely BEFORE the workout. They fuel the work, AND you will burn them off.
There's no sense in going light weight high rep. You'd be better off eating a small serving of oats, lifting like you mean it, and chasing it with a shake that has dex.