We have a 446 in our labs and honestly it’s one of the best locks out there today amongst all the choices we’ve been working over the past few years. I feel your issue with pairing, one of the tips we advise is to take the lock to the hub pair it first and then install it. The other issues can be handled very effectively through ST with the right software.
To get the most out of your Yale lock check out this custom device handler which gives you access to all it’s features (you’ll need access to RBoy Apps):
And as for programming codes you can either use the built in SmartLocks from ST (which is very basic but gets the job done) or if you need some faster, more reliable and very comprehensive (like schedules, rules, actions) and it sounds like want to daily/weekly schedules or one time codes for your repair guys etc, this is the app that will do it all for you reliably and efficiently: