I dont use the MYR/SG/SEA servers. Just use HK/Taiwan instead. The former are unreliable and are more prone to lag spikes for some reason.

Yeah yesterday I tried using WTFast but all servers are unavailable. When I logged in without WTFast its actually accessible but with the usual lag spikes. WTFast mentioned the servers cannot be pinged due to ISP restricting it. I can only log in with WTFast after about 1am. Hopefully this do not repeat again. 

All this while I can play without any tunnel even when raiding (300 ms though). All of a sudden this crap occurs. I wonder why.

Im on unifi VIP30

WTFast...I think it was about an average 150 ?

Stopped using it since I can play without tunnel now, though its about 200-240 ping.
It was unplayable for a while that is why I resorted to WTFast.

Yeaps, my unifi's pretty much the same lol.  When I had the line problem its either 150 or 5000 so WTFast was a no brainer