I'm in the process of moving my grow space from a tiny cabinet to a larger armoire cabinet. The problem is, I don't own it, so I don't want to poke too many holes in it. I'm using one of these blankets instead of mylar/paint and getting it to stay in place with twine and pushpins. The problem is, I can't get it to hang flat. Is that going to cause hotspots and burning on the plants? Also, the blanket is just a few inches too small to cover everything. Can I use computer paper or just a little foil to fill in the gaps?