AimIsADickAlso we found some new launch options in the 2018 leak. Aside from that though, yeah there isn't much left to do.
You found some new launch options. mastercomfig has already been documenting the live game's launch options and which ones to use for years.
AimIsADickAgain there is still a difference in DNS resolving, even with local caching. Cached domains have a time-to-live (TTL) which can vary. What is the TTL for domains used by TF2 and Steam?
In Source and Steam, DNS names are resolved once on connect/query. Then it uses the IP directly. Each packet send does not resolve the domain name again.
Did you think that it was resolving DNS 66 times per second or something? How would it affect performance?
Also, I don't mean to discourage you from trying new things, but I do encourage you to learn, and collaborate with others rather than spontaneously release something like this, with information against what others have advised before.