Sorry, I need to know what you installed.
If you used my own prefs file you'll have everything I have done. If you use Altemose's Easy Installer you'll get just the major speed tweaks and Hack's tweaks, while a clean install or the user.js file also just cover the major speed tweaks.
You are correct, there are other tweaks I've made that even the odds a bit. But the ones I don't mention are generally a personal choice that aren't directly related to speed (but may indirectly affect it).
So if you have NOT tried my own prefs.js file, try that and see what happens. Backup your old one first.