@shemandr makes a good point about the rudder helping you feel the needs of the boat. Too much heel and you loose control. Bring the boat back on her feet and you will gain control and speed.
@Joe is spot on. If you want to go fast you need to learn to sail fast. The best way is to practice. Tacking. Sailing up wind. Sailing on a reach. Tacking. Gybing. Tacking.
When you are serious, go crew on a boat with a skipper who wins races. Learn the skills then tack them back to your boat and practice what you learned.
More so than worrying about heel, study the art of sail trim. Learn to steer a straight path. It will ease the work of your crew and you will be faster overall. It is a real pain to trim the sails only to have the helm wandering all over the place.