Or is it much more effective to just conduct a Quiet Title process or another route

I would try searching for keywords such as "property management" and also set up keyword alerts to the same effect.

Both the bank address and bank name mirrored each other, it didn't allow for a bank name and address to be entered.

I think it's perfectly fine to ask someone for a second opinion especial if the person your working with is not a specialist in the field.There are a lot of folks like you that come to me that been with accountants for a long time but their life changes or they start earning more or doing things differently that effect taxes and those are times you want to find someone who specializes in your field. 

What is the average number of addresses on the list?

A landlord who sells a rental unit must notify you of the new owner's name and address.

The property had been vacant for years and at some point the city had tagged it as effectively “condemned” until certain code violations were resolved.

No sub will be effective via email in the field, it's just too hard to be out on site and answer emails from you iPhone.

Will they be concerned that I have their phone number and address?

There is also a SouthShoreREIA in Bourne, but their website is down so if you PM me, I'll send you the email address of the leader.