I think I was overgeared as well, I was on 52 x 15, which is what I thought I'd been doing it on last year, but it felt so languid that I may be wrong. Or maybe the wind and my legs just made it a lot tougher than I remember.
I know that would be too big for me, I wouldn't want to go higher than 88gi there as I'd rather spin on the straight than grind the hill. Tbh I wimped out of riding fixed when I saw the wind forecast.
Yeah the wind was pretty unforgiving up the hill, one of my clubmates said his normalised power was same as last week but he went 1.5 minutes slower.