CFLs don't put off much heat. Don't be afraid to let them barely touch the leaves. A few small burns here and there won't affect the plant aside from the burns. But, of course, don't let the light touch the buds. You want them about 2-3 inches away from your plants, max. Also, keeping the lights that close will keep your plant from stretching too much.
Training is also a good method to keep the plant short, as mentioned above.