My wife uses glucosamine and that has provided some relief and slowed down the deterioration. There is also some evidence to indicate the use of Turmeric to relieve the symptoms. I had similar issues with my index (mouse clicking) finger. My solution was to re-train myself to use my second and third fingers to control the mouse. It took a couple of weeks, but now it's natural and my automatic way to use the mouse.

Have you considered a 3-port USB charger such as KOPPLA from I K E A (I won't post a link but google it). I appreciate you have 4 devices, but it would reduce the number of power supplies a little. Not sure if it would provide your power requirements, but it is rated at 2.4A per port. I have had one for several years and I use it regularly for phones & tablets.