matches between KR-JP are JP servers , matches between SEA-KR are HK servers , matches between SA-KR are HK servers , matches between SA-SEA are Singapore servers , dunno about matches between SA-JP
I really doubt that FS has 70ping. I'm from SG and if i gotta play on hk servers with my friends its like 50 to 60ping, since thailand is closer it shld be less. Do you mean it the other way around?