Upgraded from 150 to 300 but not getting advertised speeds - XFinity

#1
Upgraded from 150 to 300 but not getting advertised speeds, XFinity-Comcast internet. I was subscribed to the 150mbps plan and I was usually getting about 180 on a speed test. For $20 more I upgraded to the 300mbps plan. I'm still getting the same 180mbps. Upload is the same as well.

After restarting the modem 10 times and 3 phone calls with Xfinity, they told me the Netgear is the issue and to contact Netgear. Their level 2 folks said that there may be a setting I might need to change. I thought I'd post here for more opinions. I have a Netgear C3000-100NAS. The documentation states up to 340mbps.

I would appreciate any advise. Thanks to all for looking and for your help.

(I've tested 2 machines - i3 Sky Lake with 8gb ram and another with 16gb ram. Both have giga NICs. Both are hard wired using cat5 directly into the Netgear.)
 
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