I had the same issues with my MG16. I found the LSN too rich. IT caused the engine to load up and die very quickly. Once it died it would boil the fuel back-hydrolocking it.
Just put a tiny bit of fuel on the carb base and it will cool it enough to reprime and start.
Once started I ran back up to temps and used the pinch test on the LSN settings to find the right tune. I found my LSN to be in 1.5 turns in from flush. Idles longer now and does not hydrolock. Yes my temps are fine for those leary.