Maramu Storm Jib size

I am looking to have a storm jib built for my 1980 Maramu.
It is a solent rig (genoa and jib both on furlers) and also has a baby stay which I plan to fly the storm jib from.
I am interested to hear from other Maramu owners what size their storm jib is and any first hand recommendations from sailing with it in very heavy weather.
I feel that the racing storm jib recommended sizes may be too large.
Thanks in advance.
Chris Warren
Maramu #69 Marandina