VRR would be the #1 upgrade. A mobile chip with mobile thermals and a mobile battery cannot consistently keep ahead of the screen refresh. The screen has to be the one to step down to where the APU is at.
Hall effect sticks, mandatory. My factory sticks started acting up after about a year. The Dreamcast could do it, don't tell me that they're too bleeding-edge expensive.
Squeeze a 2280 SSD in there instead of the 2230. I would give up SD and move the radios to a soldered miniboard for this.
Stop gluing the battery down.
The obvious explanation for the life expectancy differential is that girls are more likely to catch a toilet-seat borne disease.