For someone who rarely moves further than 10ft away from his spawn side of the map I'm surprised you can ever see anyone hop. Joking aside(not totally) udp packets aren't perfect. If anything has changed in your path from you to the server you could see some differences in game play. News flash your most of the way around the globe to the server. Think about possible changing network conditions on the various isps you pass through. I worked for an isp for around 11 yrs I can bore with you more details of possible changes or issues than you want to know. If I remember correctly your in Australia? I don't see how you and some of the Aussie players play the level you do with that high of a ping. I give you props for that. I doubt the net code or hit boxes have changed in the various versions of the mod. Possibly some weapon differences but I can't accurately say. Whining on our forum isn't going to accomplish much. I'm guessing there isn't much of anything in your country to play on or you wouldn't be on our servers. Here you go rent one run your own and perfect your own mod. Pretty simple right? Good luck with that.
https://www.gameservers.com