Yes, even after the heat gun, more glue had to be scraped up. We used paint stripper to get up most of the remaining glue until it got to where we could sand the rest.
I should be embarrassed to admit how long I spent doing this but.....after so many hours you just can't quit....because then all the hours that you already put into it would just be wasted and in vain. But, there was definitely many moments of thinking.....this was a stupid mistake, what was I thinking? Fake, engineered wood floors would be a welcomed site....who cares about preserving the original floors!!!!