I would start optimization by slowing your blower down enough at this charge level so that at least part of your evaporator tries to freeze. It should try to do this while the tank is cool. As the tank warms, the coil should melt, allowing the captured moisture to drain. This higher temperature gradient across the evap will reduce its effectiveness slightly, but the reduced blower draw should more than make up for it in energy savings.
Once a larger gradient is established across the evap, you may benefit by adding charge. A higher dischargepressure will speed the heating process. In a system this size, a few grams extra will make a difference. You are not far from your optimum charge.
I have a big question to ask. Can you explain what equipment you are using to log your temperature measurements? And how are you getting that data onto a computer and into a spreadsheet? Many members are mystified and intimidated by the process.
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