You could cut it down if you like. If you're doing low carb most of the time, a dose of carbs and protein, right after a hard workout will do some good. It's not going to make a huge difference going a little lighter on the dosage. The amounts in Adam's Diet are pretty conservative compared to a lot of other PWO nutrition recommendations.
I used 15-20g of P depending on how long since my last meal, to the next meal, and how much is left in the tub.
As to the carbs, I almost never have them in the drink anymore. and when I do, I just put some in. I couldn't tell you how much "some" is. I think it's a tablespoon of each. I don't think that's very much. In a pinch, I use a few (3-4) sugar packets.
Some people need the workout carbs to have a good workout. I don't need that as much.