I haven't had that particular experience, but from having read a lot on the subject and having a successful intro of a male intro with pair of females, I may be able to give some suggestions.
I mentioned that I've read a lot, and there are a few different approaches out there. I can't say that any of them are wrong, they've been successful, it's just there is not just one right way. But, there are definite wrong ways, so be careful so to protect your gliders.
1. You did good by separating their cages for "cool-down". You don't want tensions high, intros won't work.
2. Continue scent swapping, there's just no disagreement on this, it makes complete sense.
3. Mingle their scents often, even rub mingled-scented blankies on each of them.
4. I'm not a personal fan of cage swapping, but some do it and have had success.
5. I like the stacking of bonding pouches, it's the method I used, daytime. In your case, each pair in a bonding pouch, wear them layered, back to back at first. If they are quiet, start carrying them screen to screen. They can get up close and personal enough, but not hurt each other.
6. In your case, I would suggest also trying the two aggressive ones from each pair in a bonding pouch, stacked, following the same procedure. After working with pairs. Keeping their cages in separTe rooms all the while, at least until you see/hear progress.
Some people will keep a problem maker alone in one cage and the others, that get along in another cage, this sometimes works, if you have only one aggressive glider during introductions.