There's really not too much to filling an AA PCP.
Close bleed valve on tank - attach T-bar adaptor to the rifle and open the bottle to add pressure.
My AA 410 TDR needs to be filled to 190 pressure - I would imagine it's similar for yours. My TDR takes 30 - 70 seconds to fill - it's not fast - are you being patient enough?
Other than that I can't offer any more advice.