I mapped out our upcoming 600 and the climbing is just 929 meters, which is less than our 400. The wind has been gusting to 50+ km/h most days the past month and a half, but the forecast is looking promising not that it can be trusted. The forecast for today was west 10 and ended up being 30 gusting to 45 in the afternoon. Best part of the forecast is low 20s during the day and 12 at night, heat wears me down faster than the wind.
The 200 and 2 x 300s I did this year had awful headwinds that died away just as we turned down wind. 400 was calm most of the day, then a brutal headwind made the last 52 km take 4.5 hours.
I really need to do a few rides on my brevet bike this week to check the fit. I rode my mountain bike all last week and haven't been on my touring bike since I put the new bars on.