AAV is easy to inspect, wait till the engine is warm (properly warm not "idled from cold for 10mins warm"), pop off a pipe and shine a torch down - the half moon should be as good as closed. If it was stuck open your idle would be sky high anyway.
CSV - you'd be bogging down or smell the fuel if it was stuck open, its unmetered unlike the main injectors.
Fuel shut off device you should be able to hear working - or put your hand on it, rev up and over 2.5k (i cant remember the actual cut off - think its like 1.7k but higher will ensure its triggered), let off and you should feel it click. Again if it failed shut - it will not be letting any air pass and will have no influence on mixture, if its failed open, you will be getting air bypass the throttle but again i'd expect a raised idle.

I'd be looking at the WUR (warm up regulator) from a troubleshooting perspective - the part everyone overlooks on K-Jet. Monitor pressure from cold through the warm up cycle. I notice you dont mention touching your fuel filter in your list- it could be as simple as that also!