I didn't have this issue prior to updating the app with the new update.

Before I would keep my smoothness setting around 5 and it would keep my lines smooth and even. I wouldn't have any issues with my shaky hands. Now, to even notice a difference, I have to bump it up to 70+ to even notice a smoothing of the line. However, changing it to 70+ makes the line draw incredibly slow and eventually crashes the app.

Several other people have posted about this over in the support community.