The manual calls for ATF which is under a 10wt as normally posted on most sites, since ATF isn't really rated as a weight like fork oil per se.
I wouldn't put more in than specd since you are putting in a heavier oil than what came stock from the factory.
You are also quite light weight wise, so I would stick to the stock levels/quantity the manual calls for in your rebuild.
I did a 350F last year and used ATF at the stock spec and I weigh about 185 and had no issues with the ride or handling of the bike.