I’m interested in the answer to this question about stabilization myself.
For those that want/need additional stabilization a reasonable option is the Lazy Nezumi program in addition to stabilitization options also has rulers, guides and such for drawing. I don’t particular like to use it as it just one more level of complexity but if I can’t get the smoothness I need out of a program I usually launch it.
Unfortunately, Lazy Nezumi is Windows only but perhaps there is an equivalent for Mac?