I can also report much better behavior with regards to heeling under bare poles. Furthermore the ship seems to oscillate between close-hauled and a broach reach when wallowing with no canvas set. This seems more or less realistic.
However, tacking is probably a bit too hard right now. It took me about 4 minutes in 17 kts of breeze (10 kts is an important testing benchmark which I haven't tried yet). The ship loses all headway by the time it is in the eye of the wind, and loses a bit of ground overall throughout the evolution.
Is there some way to make this easier without sacrificing the progress made with the other scenarios? I would also say that ships take a long long time to coast to a halt (no canvas set) in this game (such as when you are roleplaying anchoring). So there probably isn't much scope for increasing inertia.