I hope someone may be able to provide me with some advice. I have the above Homeplug adapters. They are currently in two adjoining rooms about 4m apart. Both are updated and the connectetion is set as paired and secure. The App give the speed as below. 

However any browser based internet speed test gives less than half the quoted speed of 885Mbps - I'm getting a typical 270Mbps. A direct cable from router give a browser based speed test of about 920Mbps. 

Is there any other fault finding I can try or steps to improve? Is this all I'm going to get from the AV1300?

Thanks in advance for any input.