If you are getting condensation on your windows, you have enough humidity. Whether or not it is comfortable is a separate matter. If the humidistat is set for maximum, that is all you can do if everything else has been checked out.

You might call the manufacturer and see if they would send out someone for free to look at your problem as a goodwill gesture. If you tell about an unsatsfactory service call and your wife and new baby, they might be more wiling to send someone out without a charge to preserve their reputation. It might not hurt to mention this series of posts on this forum and how it is hurting their reputation to not have solved the problem. A little pressure on themg.