Slow website, but super optimized - DOM elements or hosting?

[jrothrock14]

So I'm shelling out like $100 for hosting, I'll refrain from saying who the host is, and I've really optimized the site; combining stylesheets and scripts; minifying javascript, css, and html; two rounds of lossy compression; and cacheing - I'm not using a plugin...

http://www.webpagetest.org/result/150825...1/details/

Low TTFB - hosting/throttling? Far away too...[/u]
http://www.webpagetest.org/result/150825...1/details/

If I redo the result, it gets better - but I honestly don't see it flipping back and forth on pages. While I do have a lot of DOM elements, I feel like my site should be loading much, much, faster - when the TTFB is good, the speed index is like 1700 - near me. I've considered moving to a dedicated server, any thoughts on who?