How do I prune my hibiscus so that it gets bushier growth?

I live in Ontario and I have a hibiscus plant that I always bring inside during the winter. It always does really well after pruning it each spring, but I notice the foliage grows long instead of compact and bushy. Is there a way to prevent it from getting such long and straggly growth? It still looks healthy, dark and green, but it almost grows too quickly as the branches get so tall. Should I fertilize it less? I usually give it a multi-purpose fertilizer for blooming plants.