Our servers are 66tic, as is every server that you play on. Since the orangebox update back in early '10, Valve removed the ability to host a 100tic server. There are server plugins that bypass this, but subsequent updates from Valve have voided that as well (i.e. modding the weapons to shoot at 100tic on the 66tic servers). Forcing the server to 100tic now would be ridiculous, and we at N|U will not be doing it to any of the servers.

Cooker, you also have to take in to account distance from the server. Our hosted box is currently in New Jersey, so maybe you have more hops between you and the server.