If you are just looking for an excuse to get out then just do it. Waaaaaaa

Sailing in light air requires a lot of technique to keep your boat moving and reading the course lanes etc. Yes at +400 you likely have a little more work, but anyone can make their boat go in 12 and in the big stuff you have an advantage way above your skill level.
Good finishes when it blows like stink does not mean you area good sailor, just heavy. If you are going to use weight as an excuse, it swings both ways, use it properly