I'm pretty sure the one touch down relay has nothing to do with it. When you press the down button for a quick duration the GEM senses this and activates the relay to pull your window down. When the window reaches the bottom, there is a spike of current because the motor strains a little. The gem senses this and deactivates the relay.
I could be mistaken but I would have to look at some diagrams later tonight to confirm this.
I'm thinking your motor is getting weak. It sounds like its losing its grunt. Its a whole lot easier to drop the window than to raise it back up. One thing you can to see if the window guide is greased. Its the rail that goes in the middle of the door that the regulator arm attaches to.
Quality Engineer (Electronics) for Kia Motors
University of Tennessee Electrical Engineering Graduate
2000 XLT 2.5L A/T