I have always had good luck heating the can under the tap with hot water. Run it under for 5--10 minutes while shaking.

After shooting i have had great luck putting under a hot lamp to help bake it. For a cab i would use a halogen work light and try and get some hat into the curing paint.

It does sound like you are shooting a little too dry. Spray painting is really about being able to see the sheen of the layer as you put it down, ( it helps to be able to see the coat at an angle as you lay it down) and being able to blend the passes together so they become one coat not a series of passes. You need to be able to balance too much (it will run and not cure properly) and too little ( it will come out dry and you will be able to see the passes as distinct paths after it cures, and the finish will be flatter than it is supposed to be).

it takes practice....Keep trying on scrap, do test swatches. be methodical ( keep records in an effort to make things repeatable ). After a while it's a real pleasure to be able to lay out a nice coat.