okay well to figure out why they are flowering then you have to look at the light and whether when they were outdoors, they were getting deep shade for part of the day. If that still makes no sense, are you positive you are not running an auto strain?

Thrips are annoying but relatively easy to deal with. Pyrethrin works very well. The Safers brand fruit and vegetable insect spray they sell at home dePOT is perfect for this.