A couple thoughts
one, the General English forum may not be the best place for this. I honestly dont know if SE pays much attention here. if anything technical support might at least get eyes on it from someone that could escalate it as a technical issue, here, not a chance.
two. have you tried the new Oceana server to test what the ping is like there?
three. I would fully expect some place located within your borders, well within the scope of your ISP to have decent ping. the IP you are going through is through at least 7 countries with varying levels of service etc. I am not sure how much influence SE would have over those ISP's

ultimately, your best attempt to get your own server would be, post somewhere that things likely have a system for tracking issues, like support forums. a couple people complaining in the general english forum will not get you anywhere, why? its not monitored. Technical Support people do not monitor this forum to check for issues. your best chance for any visibility on this kind of issue is going to be in that kind of venue.