I wouldn't worry about it. I have wisteria in my tank with ~1.33 wpg and when I first moved it in a lot of the plant turned brown.
I've found that, as has been said, no matter what changes, and whether for good or bad, the plant will have an adjustment phase. Kind of interesting: moving the wisteria in, most plants looked a little sickly for a couple of days and then took off like weeds, but when I moved in my barclaya longifolias, all immediately put on like 3-4 leaves!
Good luck but I don't think you're in big trouble; I think trimming back and just waiting for the adjustment to happen is your best bet.