I now feel I should have brought in my agent as well to help better comp the area.

It's interesting to see data supporting what've been feeling.

Feel free to ask questions pertaining to JC neighborhoods as you go   

I feel as though Lennar believes they can sell these units regardless if I back out and they don’t care what my inspection reports found.

It seems like you been having pain with this decision for close to 15 years.Life is too short to hold on to things that hurt you.Sell it.You will feel much better once you no longer have to make those HOA / mortgage payment on this property.

But I do not like the feeling of being bullied and brushed off. 

If you need help, please feel free to let me know.

And I got a feeling your rather novice, using something as outdated as a 70% rule of thumb, I haven't used such in over a decade.   

Feel free to DM me if I can be of further assistance.

I'll also call up a couple others to get a feel for what to expect.