I'd take the door panels off and clean/lube all the inner parts. Then sit and watch all the inner parts working with the panel off and the door open. I just completely disassembled my doors for painting, it's not that hard. I bet it's sticking at the bottom of the door....
There's a part that resembles a long skinny "U" that attaches the outer door handle to the opening mechanism that might be binding.
once again...clean and spray with a white/lithium grease and see if it helps.
""Leave it stock, it will live longer. Just understand that its never gonna be as fast as a minivan""