Reply #19 here addresses your issue: Engine Starting issue
This is page 2 of a long discussion that seems to parallel your problem.
It's sure easy for us to spend your $$
, but if it's the switch, what else ya gonna do?
Just for grins & giggles: What I would have said in an introduction to your topic, instead of: "...but I'm not about to go searching for what I need so let's talk about it."
would have been: "I've searched all over and can't find something specifically that addresses my issue and would appreciate your help." Well, maybe that's what you tried to say, and lots of us enjoy helping out, but I had a guy who once actually wrote: "It's easier for me to ask and have you guys do the work for me." I trust that wasn't your intention.
Anyway, while we're at it, I agree with Brian, take the AO off your switch. You don't even need to buy anything else, 'cuz if you plug in with a multiple output shorepower charger, your reserve bank will always be charged, and, if necessary, you can always use "B" when running the alternator! Simple change in wiring makes a great big difference: get on the boat, switch to house bank and leave it there.
Maine Sail, Brian and I have been promoting this for some time, but I digress, 'cuz it wasn't really your question.
Ah, thread drift is almost as much fun as doing someone else's research.
With all in good humor, and good luck with your troubleshooting...