Which one do you use and which one works best for you?
Yes, I've tried leatrix and other registry tweaks which seem to have a slight improvement though you can't beat SSH tunneling (without getting a better ISP)
I'm using lowerping and get 39~ms in game with a 24~25ms ping when pinging the England 1 server on lowerping which is pretty great.
I haven't tried any others but I did run some ping tests for free on competing clients, I got 20ms ping to london server with smoothping so I might try it out (cause its 4~5ms quicker than lowerping for me)
Without tunneling I get 55~80ms.