Use 1500 lightly I mean literally tickle it across towards the side that needs blending until smooth. Do the same between every coat of lacquer, afterwards if you've got some use 2000 or higher sandpaper, if using 2000 get some g3 or g6 on it, compound till smooth to the touch and then polish the absolute crap out of it. Check after the first coat of lacquer that the colour is a good match and carry on lacquering if it looks good. It should be ok but after that you just need to match the lacquer.
Other things, when feeling if smooth or not, close your eyes. Easier to feel with one sense than two.
Put the cans of lacquer in a hot bucket of water to warm them, this will help adhesion and increase the pressure in the can making it less likely to spit. When you're done with the can if you're going to take a break, hold can upside down and spray to clear the nozzle.
If you get stuck mate give me a shout, think Amy has my number. Sounds like you've got it down though