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Is this throttling?

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Is this throttling?

I have the 300 blast package. I am connected to comcast gateway, wired to my PC , If i goto  i get this 356 Mbps . If i try any other speed test , its much slower between 35 and 100 Mbps . ( ill show results below) .   I have tried at various times of day and many locations . My speed is much slower . The only places it shows normal is xfinity branded speedtest and when i download a game through steam. I suspect throttling on certain ports that prevent me from getting my max speed. i have no issues until a few months ago when i signed up for the unlimited cap addon. Does Comcast throttle after a certain level? If im not gonna get 300 down, by pay for it .  Also , i have rebooted, factory reset the modem , spoken to the higher level support ( wireless something or other , not sure the title) and he was stumped too. This has been tested on two diffrent computers both hardlined into the router.