Only getting max download of 33 Mbps with new DOCSIS 3 Motorola SB6183 16channel modem and Premier upgrade

I had a very old DOCSIS 2 modem until recently when I received my new DOCSIS 3.0 Motorola SB6183 in the mail.

I was on Preferred Internet and would get 20-25 Mbps reliably and actually got 33 Mbps this am before changing out the modem.

I swapped the modems and called support to activate new modem - I had the rep upgrade me to Premier at that time.

I am still capping at 33 Mbps downloads and about 7 Mbps uploads despite the upgrade.

Could someone check to see if anything can be done on the COX end of things to speed up the connection?

Thanks!