Working Jib Specs

I have an old working jib that has reached the end of its useful life.  I'm going to replace it but found that the original CO26 specs didn't seem to include a sail of these dimensions.  This is what I have:

Luff   27’7”

Leech 24’7”

Foot   10’

125 sq. ft.

5.5 oz. Dacron

I generally use it in heavy weather and it's reefable too.  My question is this: Does anyone have an opinion on specs for a heavy weather sail?