Going to purchase a temp gun to check the exhaust temps on each cylinder just to see if we have anything funny going on. Those guns have become really resonable in price and a quick way to check individule cylinder issues.
I use a spray bottle of water ( $1 walmart ) spray each header pipe with the water, if the water vaporizes on contact, it's firing, if not then you got a weak or misfiring cylinder = just a thought> Cp