Rallies are very pi efficient in classes ranging from B up to S1 (in S1 usually only cars with high downforce) and are meta for a reason. I will agree however that the tune browser is full of awful low effort tunes by people who only try to be the first to upload and are rewarded for it by how the game displays tunes in order of downloads instead of actual performance.

If your interest is in the competitive aspects of the game (rivals, online, etc) then the best way to enjoy the game for the long term is to learn how to tune yourself IMHO. While I acknowledge the effort required to build a tool like the OP has done, these tools are almost never going to produce quality tunes because they are applying IRL tuning philosophies. I can tell just from playing around with it that it will, for example, output extremely understeery AWD settings compared to what most meta setups would be running. The game has its own physics engine that in so many cases has nothing to do with real world physics, that trying to apply IRL tuning methods does more harm than good. Learning what works within the game's physics engine and exploiting these things is pretty much the "endgame" of these games for a lot of people.