Were all the paints (I'm assuming spray cans) from the same manufacturer, and were they all acrylic or poly, or did you use a mixture of both types?

If they were all the same brand and type of paint, then I suspect one or more of the cans had a bad batch of paint in it, as the surface certainly shouldn't still feel tacky.

I suspect the only way that you are going to solve the problem is to strip the paint off and start again. It's hard work I know, but sometimes it's the only way. I'm in the process of a second strip-down on my ES-3, but I'll get there.