Welcome to the Forum!
You've done well describing symptoms and what you've done so far.
AND, Most Importantly, Model and Spec! We had a lot of generator experts for awhile, but our members were vague in their descriptions and lacking in that Model/Spec info, to where many of those experts bailed.
Do you have the Service Manual for this generator? We can probably help with at least that, then you can at least follow their troubleshooting flowchart.
I do know that mud daubers and spiders love LPG. Look for webs, mud, and nests, especially around the regulator and carburetor areas.
It's a long shot, but there might have been an insect obstruction and you broke it loose pulling the generator. I'd hate to see you heave it all back in only to find there was still a problem.
If it's rich, and LPG pressure is a little high, sounds to me, NON Expert, that regulator setting could be an issue too.