I like to veg with MH if I have them on hand, but you can use HPS just fine also.....to your other question, I would remove the flowers that are recieving little light. These will just end up being tiny little larf anyway. That way your plant concentrates all it's energy towards flower production on the best tops. I usually do this at week 3, because that is when the stretch usually stops, and you can see what flower sites are recieving the best light. I usually do not remove any fan leaves up top unless they are blocking a bud site, or to increase a little air flow. That is usually on tighter node indica plants more though.