Plug should look pretty normal for a two stroke, the plug temp, ports etc are all intended to work well with idling around a lot
Are you by chance new to trials bikes or two strokes? Mine starts really easily, but I can see where if someone wasn't used to kicking over a trials bike it might take some getting used-to with the short kicker, high compression and squashy suspension.
I haven't checked my carb settings, but it runs well
The choke is weird and sorta difficult to use, are you getting it all the way up (IIRC the lever goes pretty much vertical)? To get it back down you'll probably need very flexible fingers or some sort of loop attached to the end of the choke lever, mine has a zip-tie on it from the PO that works well enough.