New tech manual typically comes out the week of the race. They wait till the last second really.

I too am a cat4, I too am in my first year of racing, and I too will be doing the 4/5 field mostly because I got suckered into doing it by teammates. I guess it beats doing the Cat4 field by myself. I am not a tall guy but have some weight, 5'9 coming in at 155lbs.