Dan,
I must have been writing the last note as you were writing yours!
I think experimenting with some supplementation is warranted, but I’d be careful about the high dose vitamin C, since it inhibits both zinc and copper absorption. I know Paul Jaminet thinks the approach is low risk, but the devastation of low copper is great. I can’t find some studies I found on this in my computer right now, but some vitamin C supplementers (1,000-2,000 mg daily for a couple years) have induced paralysis due to copper deficiency. Since it would be hard to tell exactly which nutrients you are or are not low in right now (and are likely low in nearly all of them), taking anything that would compete strongly with something else is potentially dangerous.
But do what you think is best! We’re all different snowflakes, as they say, and surely high dose vitamin C has helped many people!