Update:
I've had some reveg the past few days (long single-leaf shoots on top of buds) so I checked the timer, light leaks and far red setup. Sure enough one of the far red leds had stopped working (which means none of them work), so the plants had been on a 13,5/10,5 with no far red schedule lately, which has pushed them to reveg....
I can't get the far red driver to power only two far red leds, so I'll have to flower without far red the rest of this project. The good thing is that this proves the far reds work and can actually shorten the amount of dark needed to flower. I know there's a lot of you who know this already, but it's cool to see it first hand. I'll be doing a 11,5/12,5 regime the rest of flower. Hope the plants do fine and continue flowering.
EDIT: Actually I have a bunch of old resistors in the attic somewhere, could one of those replace the damaged led to bump the Vf to within the range of the driver?