I believe it is the first year for the ride. That said I have to be frank. Mt George is not very safe to ride. East to west it is marginally safer than the reverse so that is good. However, I'd check with the club to see what they are doing about traffic control. Bill and I won't ride it again. It is narrow and twist with slightly better sight lines starting from the east. Several riders at the Santa Rosa 200k brevet said that they were not riding the Davis 200k brevet because it went over Mt. George. Maybe the MSC will have enough more riders to wake-up the drivers.
Descending past Lake Berryessa to Winters (Cardiac) should be ok but realize that the turns aren't tight enough to slow traffic below the speed of bikes so just be careful. There are a lot of marinas, pick-ups and boat trailers at that time of year. We will only climb it in boating season (opposite of the century) very, very, early in the morning or with another event. We did last year when the Davis Double riders were out.
These are all my stomping grounds for hill riding. I'd be happy to take you on and all of those roads -- except for Mt. George. It would be a really nice loop if it weren't for the traffic on George.
"We" haven't talked about it this year, but we could do another Dam, Corners and Valley ride on 5/19 (the Davis Double) where we start in Winters and ride the metric route counter-clockwise. We could add more miles by doing an out and back toward Turtle Rock or Pope Valley if you want more than a metric.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.