Leave as much on the clone as you can. The more you take off, the less likely the plant will thrive or even survive. Is a few leaves 3 or 15? 3 is not enough hardly for the plant to photosynthisis like it needs too. If there is 15 good healthy leaves, you could stand to loose a few, but why do that? Like someone suggested, If you don't have a lot of good leaves, then you should leave the bud on there. Otherwise smoke it. Once a plant is completely revegged, that is it has started growing leaves again, then it needs at least a couple weeks of vegging before you bud again. The longer you veg, the more bud you will get in the end.

And in my opinion the veg cycle needs dark too, not just all light. Plants take in what they need during the day, and process it at night. If there is no night ever, it can't process the nutrients and light the way it needs to, resulting in less than optimum yield.