Yeah thats my next plan of attack Mac.
I'll reinstall the stock carby and see how that goes. Maybe I do have another problem. How would I know though

The spark plug looks good though but it's hardly an indicator of what's happening in the engine given how little heat I can get into it.
I haven't changed anything on the engine since I last took it out. It felt okay last time I rode it except for feeling a bit weak as if it needed a touch more fuel when the stock carby was installed.