Suck Fermentation/ Yeast Nutrient?

Hi,
I have two carboys with an imperial pilsner/wheat/pale and used an american ale yeast in one and a belgium yeast in the other. They have been cooking around 65* for 6 days and have slowed a lot by now. I am making them for an occasion on the 30th of june and really want to have good carbonation. I have some yeast nutrient from a batch of mead recently and am wondering;

If I add a little of the nutrient while racking then bottle in a few days will that help add carbonation in the bottle? Would it be better to add it at bottling? Or just skip it?

Thanks for reading the question,
Cheers

Buy beer for your event, your brew will not be ready by then. Even if carbed, it will be a green beer.