@ComcastMorgan I am having the same exact issue as th OP. Could you contact me also please? I have tried all the same things he has and am sitting in the same boat with the upload being where it is supposed to be, but my download comes in aright around 300 mbps. I have motorola 8600 also, witht eh gigabit plan. I will send you a PM also. Thanks.
Hello jasonpeters152, I don't see a private message from you on my end but I'd be glad to help you with getting your speeds up to par. To get started please send me a private message with your full name by clicking on my name (ComcastAmir) and then click "Send a message".