Help

I love Halo, it's the only game I own. Not that great though and hang out in mid Platinum, but I'm about to stop playing all together because the lag is beyond broken for me. I've had maybe 1 game in the past 30 that was smooth. I don't remember it being this bad a few months back. Is there anything I can do other that what I listed below to improve gameplay latency or is it just a server thing? I know it's a problem outside US and people are wanting region lock, but I'm in the US and I'm just exhausted from trying everything.

Things I've already done: set NAT to open port forward, new router, consistent 50mb down:5mb up

I'm running wireless and latency is 105-115ms. Is this decent? I have no idea.

Help me out man!