ASUS 88U - killing my download speed

Hello,

Equipment:
Asus 88u - wireless router
Arris SB6190 - cable modem
Asus G75vw - laptop

Service/ISP - 300/30 - Comcast

For some reason my router is killing my download speed. I have connected via cat7 directly to my SB6190 and I get 260 to 330Mb download and around 30 up. When connected to the 88U I get barely 7Mb down but 30Mb up.

Asus 88U is running Merlin 380.63_2.

Any suggestions?

Thanks
Mike