Sorry, I can't help with your problem.
But the SPP6E I installed on my Coleman AC about 10 years ago makes starting the compressor a breeze for my generator. My multi-meters aren't very fast, but they would display an initial drop into the 90s before the compressor fully cycled up. With the hard start, they never display below 100vac. Also, before installing the hard start, I could hear the compressor trying to start for a second or so (even on 30 amp shore power). Since the kit was installed it "appears" to start instantly. My Yamaha 2800i can now comfortably run it in economode.