Hi Dane,
A laminar flow only supplies a slow movement of clean air as a form of positive pressure. If your sterile technique and items that you are working with are not sterile, you will still get contamination. The benefit of a laminar flow is ease of access, as the frontal opening is large.
If you are getting contamination at the replating stage, then the contaminants are not the result of the glove box, but due to something that you are introducing at that time. You need to make sure that the external surfaces of the mother flask are well sterilized. The most difficult point of contamination to correct is the junction of lid to bottle/tub. This can be kept clean by applying clingfilm to the lid/neck at first flasking.
If you managed to produce clean mother flasks in your glovebox, then you should be able to replate. Personally I would loose the gloves. Air born contaminants move on air currents and by settling. If you move slowly and wash your hands and forearms well before you start, you should have no problems. Spray your hands and forearms with 70% alcohol each time you introduce them into your clean box, and remember, move slowly and keep your movements smooth (reduce air currents).
I use 70% alcohol to surface sterilize, (Dischem sell a good surface spray in a red bottle). Your flasks should not be in the box and certainly not open when you spray the inside of the box or sterilize the surfaces (Tyrone getting alcohol by being messy is confusing)
The easiest way to do your first replate is to squirt 1 or 2 ml of sterilized distilled water into the mother flask, loosen the protocorms with a spoonula, swirl and pour a bit into each replate. Be very sure that the neck of the motherflask is sterile before you do this. The thinned mother flask can be kept and recapped again. This works well, is supa fast and because of the speed, the replates are open only for the briefest moment. Also, you are not repeatedly introducing an object (spoonula or other) into your replate flask. Remember contamination is more likely the more times you interfere with the flask as well as the length of time that it remains open.
Obviously the 'pour' method does not work with subsequent replates as soon as there are roots and leaves involved.