Not looking bad, but likely there is a rootbound issue. I have no problems transplanting up to three weeks into flower, but the fresh soil must not contain time-release nutes.

With virtually every crop I transplant at two weeks into flower with no adverse side-effects, except that they do stretch a tad. An extra week in flower, and they fill in nicely.

Might have been going a tad heavy on the nitrogen, (deep-dark green, burned tips) When you say you switched...you did mean a switch to flowering nutes, right?