Download speed consistently slower than upload speed

I have been getting download speeds about two thirds of my upload speeds recently.

I thought it might be due to an old out of date modem i had, so I updated the modem to the new-ish motorola SBG6782.

Resulting in the same download slower than upload ( as measured on coxs speed test and others ).

Some forum surfing showed that there may be a "service code" that needs to be set from somebody from cox when a modem gets changed?

Also, coxs initial web intercept / new modem registration screen doesn't recognize the SBG6782 even though it is on the compatible modems list. ( I used my correct serial and hfc mac numbers, but had to tell the system it was a SB6141 to get connectivity.

Any mods able to do a line check, or send one of these codes down the line?