Just a thought. The problem for slow starting after warm up could be a fuel related issue. If the fuel near the point of entering the engine is getting hot enough before startup it could be partially vaporizing creating a mild case of vapor lock. I use 93 octane and haven't experienced this problem but I also haven't parked my roadster in 100 degree + temps either. If the slow startup problem goes away once the air temperatures begin to lower then I would conclude your problem is fuel related as in ethanol additive in the fuel. As a test, you can try adding some Marvel Mystery oil to a tank of fuel to help reduce the possibilities of your problem being vaporization related.