Just a question, are you running the new coils via the ballast resistor ?, pretty sure you don't have to with what you have, if u are then it might be the reason for the troubles, also I have a '79, my main needles have the clip on the middle groove, found it was ok, never touched it, balance your carbies, can cause heaps of problems, and they have to be on the bike and it running to do a proper job, first start on mine when I did the re-build was bad, I stuffed up with the cork gasket on the output shaft, so she filled the tail shaft tube with oil and it leaked out everywhere, but the 4 turns out for the idle jets is a good starting place, make sure u have the accelerator cables not too tight. Make sure your timing advancer isn't stuck and opens and returns easy, that will make sure your spark is right at idle and higher revs, timing light will tell you if it's advancing ok, sometimes they get a tad stuck or the springs are weak, good luck