Yes, the mixture screw is behind that little plug. I typically take them out when I have the carb in my hand. Based on your plug reading, you are going to need to rejet your main anyways. While you have the carb out, you actually get a little drill bit and a self tapping screw. Drill just enough to get through that cover, then thread the screw into the hole where it gets a good bite and use the screw to pull that cover out.
Yours is the first one I have heard of to have a 108 main jet in it. I would step down to a 125 and see how that looks. The 130 is a good jet with your mods for the typical carbide that comes with a 114 main.
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