W-Lan Speed Problem

I have a question. When i transfere files between my PC and my Phone or Tablet the transfere speed is terrible slow.
But first a few infos about the used Hardware.
Router is a FB 7590 running 2,4 and 5GHz,
PC W-Lan adapter is a Asus USB AC56 2,4GHz with 300Mbps 5GHz with 866mbps.
Phone Samsung S8 with SanDisk Extreme 128 GB microSDXC Class 10
Tablet Samsung Tab A 10.5 with SanDisk Extreme 400GB microSDXC Class 10
Connections running on 5GHz with good signal strength (Fritz W-Lan app showes ~20-30db)
But when transfering files i get max 25-40Mbps. I tried different apps and tools but the speed is always the same.
At the moment i use Total Comander on Tablet and Phone and i have set up windows 7 to have access to some folders via network.
Is there anything i can do to get more transfere speed? With this low speed it is not funny when i copy 50GB, 100GB or more.

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