I have been sailing a Hobie 16 for a few years now, mostly alone. Being rather heavy I come close to your weight together but in light conditions (<5 Bft) it is kind of difficult for me to right the cat. I use 2 devices: a small floater at the top of my mast (2 section mast, tends to float less..) and I have a plastic shopping bag. I fill the bag completely with water (>20 liter, about 4 gallon) and hang it over my shoulder. With this added weight I can right my Hobie 16, even without any wind. With more wind however (>5 Bft) I manage alone, even without the bag! However I strongly recommend to do some practise on a hot day, light wind and nice water temperatures. And: always take a ± 15 m' long line with you. In case needed a motorboat can always help you out and put the boat back on it's bananas.
Cannot give any recommendation on crew weight in race conditions, besides:
In light conditions it will be an advantage (when allowed), in tougher conditions more weight on board can be helpfull. By the way: we have only a few Hobies at the club. It must be nice to have a large fleet to match with! I envy you..
Happy sailing and good luck