All gliders will crab when you first get them - even if they are babies. I promise you, your gliders WILL bond eventually. It just takes a lot of time and patience. Don't give up on them!
Like BYK_Chainsaw said, gliders don't like lights and they'll hide when it comes on. If you turn on a dim lamp in the room that they're in, they'll be much more comfortable around you.
Bonding pouches, treats and feeding them from your hand are all great things! Keep it up. Do tent time as often as you can. I had a male who was incredibly skittish and I didn't know how to bond with him. What I ended up doing was standing by the cage every night and talking to him through the bars. I waited until he was interested in me, came up to the bars and then I opened the cage doors (in a glider safe room w/ the door closed) and I put my arm in the cage and waited for him to come to me. It was a month or so of doing this before he even ventured to stand on my arm. But I kept doing that and now he is comfortable hanging out with me. Gliders aren't really cuddly and they don't like being "held" in hands. But they do enjoy crawling on your arms and shoulders and torso. :)