Spoofing your user agent on your own typically makes you easier to fingerprint, not harder.  See footnote 3 of the Panopticlick 1.0 paper:
<a href="https:&#x2F;&#x2F;panopticlick.eff.org&#x2F;static&#x2F;browser-uniqueness.pdf" rel="nofollow">https:&#x2F;&#x2F;panopticlick.eff.org&#x2F;static&#x2F;browser-uniqueness.pdf</a><p>It&#x27;s more plausible for a large population of browsers to share a single spoofed user agent; all of the Tor Browsers pretend to be a single specific version of Firefox for Windows.