If you're growing outdoors, you won't have much veg time left. I think the summer equinox is about 3 weeks away, which means after that the days will get shorter and your plant will start to flower. I would keep these going, I am sure they will be fine.

Also, you cannot FIM a plant in flower because you would be chopping off the main bud and it will induce a rather high level of stress to do that and you'll probably end up with a herm.