I'll give you my OPINION on your issue...
1. I wouldn't worry about the presence of a small amount of light in veg. In flowering, your basically trying to tell the female, that life as she knows it, is about to end. So, all the things you can do to induce "panic" in the females(causing them to put on max. bud mass), the better. This is my understanding of why complete darkness is striven for.

2. LED's put off so few lumens, I wouldn't worry about it at all. If your really paranoid, you could put a small pc of electrical tape over each LED during the dark cycle.