Hi all and wondered if anyone can help? 

I recently got a full fibre upgrade (910mbps) from EE and have a couple of Deco S4 around the house. I managed to get these hard wired straight to the EE router and use them as access points at different locations in the house (ground floor & 1st floor). I'm getting around 300-400mbps when speed tested but was expecting this to be higher, if not doubled. Am I doing or looking at this the wrong way and should be pleased with this? I can't seem to find anything on line to improve the wifi performance and thought I'd ask if anyone is getting higher wifi speeds based on what I'm doing. 

Any pointers or help would be appreciated. 

Thanks