WTFast used to give me 190 ping now doesn't?

So i play Minecraft, and since i live in Asia, my connection to us servers is terrible, i get 300 ping without using wtfast, but when i use wtfast i get 190 ping, and i got used to that, then suddenly 3 days ago, i connected to the EXACT same server i connected to before, and got a 280 ping, help on how to get my 190 ping back please?