[Blas]

I would check the fan connection closer. Be sure the female coupler is tight on the male connector. Tough to see from the photo but check the wire crimp on the female connector. Might be loose. The flasher cracked because of the spring clamp that held it on the fuse panel. Easily replaced at any automotive parts store. Can’t make out the other photo well but appears to be the fuel gauge power Wiring going to the 10V step-down. BTW: I have a Wiring Diagram for your car if interested.
The AMP meter is not a precision instrument. When you are crusing with the RPM’s above 2000 and the lights on and fans kick on, you will see the gauge dip negative momentarily, but the alternator output should be feeding everything at that RPM. With a little extra showing on the gauge usually. I would suggest not bothering to look for a problem until it presents itself in this case. The battery sounds well charged for your description. don’t fix it if it ain’t broken. I suggest you become acquainted with the way your car operates and make note of any differences when they occur. If you got into another Superformance I would guess that it would operate “different” than yours but not necessarily “better”. Look for something odd happening to determine a problem.
Blas