1. How UNIQUE must tier 1 content be?
  • 1000-1500 words
  • Must include Subheadings and Subtopics
  • 75% Minimum Uniqueness
  • 3x Sentence Variations
  • 15 Minimum Title Variations
  • Spun at Word Level as well (Only where it makes sense)
But we strongly advise to at least start off with 1000-2000 words of content for the homepage and 750-1500 word pages for your additional main keywords.

It is not advisable to exceed a keyword density of more than 1.5-2.0% per page. We personally stick with a ~1% keyword density for any given page and thus far it has proven to be most optimal. If you optimize your pages well, the search engine will know what keywords you are targeting, without you having to stuff the keyword into every possible spot within your content.

These are all 100% Manually spun to ensure they are all 100% readable

As you can see from the the image below, the keyword we are targeting in our example is included in the header of the content, the title, the URL, 4x in the content, resulting in a keyword density of roughly ~1%, and in the meta description.
Using Yoast SEO
2. CB + CS + Deathbycaptcha ? Stack??
CB is able to send failed captchas to a service, whereas CS is not. You will need to switch the order from CB -> CS to CS -> CB and adjust your GSA/CB options accordingly. Run CS as a webserver and turn off the webserver for CB.

 CB solves a higher % of the captchas I see when posting, however CS solves some that CB cannot. The obvious choice is using both; good on you for using your head.