Very High Latency/ping on Xbox

I have fast internet, but my latency is constantly high on my xbox, around 70 ms, when I should be around at most 30, which is average for the urban city I live in. I am hard-wired, my ports are forwarded, the whole 9. Had two technicians come out and they did nothing but blame it on one another. Any idea for fixes? I have tried what I believe is everything.