In general, wool batting can be quilted densely without getting stiff or heavy. I use it quite a bit in my customer work, esp for larger bed quilts. It weighs less than cotton so makes those giant bed quilts easier for the customer to handle, nicer to sleep under because it doesn't weigh down so heavily on the body, yet is warm and drapes well. It's also washable.
I prefer Quilters Dream Wool. Others like Hobbs Wool. I think you'll be fine doing your heavy quilting with wool. However, I agree with Margo about doing a test, never hurts!