In regards to your index.html file, you aren’t seeing any hashes for JS file includes in the production build? If you see hashes, they aren’t necessarily going to change if you just rebuild without changing any code. Can you share what the file looks like, both the dev/raw version and the built/compiled version?
And for your .htaccess, I think you want the following instead of private (assuming that you have right syntax):
Header set Cache-Control "no-store"