I use a fertilizer with a 1-1-1 ratio of N-P-K. Usually granular, but composted bovine (cattle) manure is excellent just less concentrated, Avoid high nitrate fertilizers whether granular or composted poultry manures. It will give you more vine than fruit. Golden Hubbard is slightly small than Blue or Green Hubbards which I normally grow, but it is still a big squash. The only time I would prune would be if I was trying to grow a giant size. In that case I would remove all the fruits except two perfect specimens per vine.
