Starting issue

67Dart273's comment is correct. Besides IGN2 not coming out of the key switch correctly, it could get lost on the path thru your bulkhead connector. Connect a multimeter from coil+ to gnd. It should measure close to battery voltage (>8 V) while an assistant turns the key switch. You should also see bright flashes on your in-line spark tester.

Thanks for detailing how you determined TDC on compression. It is possible that the engine spun around another rev after you cut the starter, so you were actually off 180. I have usually turned one over by hand while feeling for pressure. On some engines you can do that by pulling on the fan belts. Otherwise, I use a remote switch and jog it, stopping as soon as I feel pressure, then manually rotate more to TDC.