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Trying to ensure crawlers can access all important info on a new responsive website, but it's javascript-heavy. Following Google's advice/best practices, but can't get the Fetch and Render tool to confirm it's working.

Anyone dealt with this before?

Also posted in Product Forums with more detail: https://productforums.google.com/forum/#!msg/webmasters/PjxtBYClupw/56id80FUQdMJ

I'm in the middle of a massive cleanup effort of old duplicate content on my site, but trying to make sure I'm doing enough.

My main concern now is a large group of landing pages. For example:

http://www.boxerproperty.com/lease-office-space/office-space/dallas

http://www.boxerproperty.com/lease-office-space/executive-suites/dallas

http://www.boxerproperty.com/lease-office-space/medical-space/dallas

And these are just the tip of the iceberg. For now, I've put canonical tags on each sub-page to direct to the main market page (the second two both point to the first, http://www.boxerproperty.com/lease-office-space/office-space/dallas for example). However this situation is in many other cities as well, and each has a main page like the first one above. For instance:

http://www.boxerproperty.com/lease-office-space/office-space/atlanta

http://www.boxerproperty.com/lease-office-space/office-space/chicago

http://www.boxerproperty.com/lease-office-space/office-space/houston

Obviously the previous SEO was pretty heavy-handed with all of these, but my question for now is should I even bother with canonical tags for all of the sub-pages to the main pages (medical-space or executive-suites to office-space), or is the presence of all these pages problematic in itself? In other words, should http://www.boxerproperty.com/lease-office-space/office-space/chicago and http://www.boxerproperty.com/lease-office-space/office-space/houston and all the others have canonical tags pointing to just one page, or should a lot of these simply be deleted?

I'm continually finding more and more sub-pages that have used the same template, so I'm just not sure the best way to handle all of them. Looking back historically in Analytics, it appears many of these did drive significant organic traffic in the past, so I'm going to have a tough time justifying deleting a lot of them.

Any advice?