I would transplant and try to give it a few weeks first. But I've transplanted on flip day too. It's not ideal, but sometimes you gotta do what you gotta do.
I actually just transplanted an overgrown Chem 91 from a 3 gallon to a 15 and put it straight in my flower closet on Friday. Not ideal since I didn't let the roots expand out, but it'll be fine.