Hello!
I'm so sorry for that stress. I am no expert here, and it may be that someone will correct me here, but I thought I would share my opinion just in case it helps.
I think now that they know where each others cages are they may keep fighting the way you described, and that keeping watch over one cage while the other plays is super stressful on you and probably to an extent on your gliders then, too. The gliders fighting is very stressful to them (I'm Captain Obvious here) and I think it may even harm their ability to get along in the future. I do not think gliders can "fight it out" and then be friends later. I believe that it's a colony thing...but maybe someone else knows more about that. I would never let them fight at all...when animals fight over territory it's usually to the death. Maybe someone else has a more informed opinion on that...?
I had the same problem for a while. When my quad would come out to play I had to keep guard over Luna's cage to make sure they didn't get on it to attack her. It was very stressful to all of us! The best decision I made was to move one cage into a different room. It was much less stressful to glider proof a new room. Once I moved the cage, my quad seemed calmer and happier again. My single girl also became much happier, and in fact has stopped over grooming her tail and the hair is growing back. I'll continue to scent swap over time and perhaps try melding the two colonies, but for now, they each have their own space. Btw I have to get Luna a cagemate now because I firmly believe she NEEDS a friend! lol that will be six gliders for me!
As for playtime, you are so generous and wonderful to give your gliders so much time! Here's where folks may correct me again...I always tell my husband that they can't tell time. If their playtime is shortened to make time for the other colony, as long as it's still fun and you're there (you could do two hours each glider) they will still be happy little fuzzbutts! I'm sorry that the two didn't connect right away...I guess that happens as you and I both know now! I hope you can find a way to have different colonies in different rooms and double the love. Take a deep breath. Let me know what happens. Everything happens for a reason and you will figure this one out.