When using wireless and testing for throughput, there's a number of factors involved that won't have anything to do with Samba (SMB). If you're running wireless and trying to determine the best locations in your house for the best speed, etc., you might consider taking a looki at -> iperf. Iperf works in a client / server arrangement. Install Iperf on two different clients for point-to-point testing with two wired connections to the router, one wired with the other wireless, etc.
Iperf will give you an idea of what your best case transfer rate is, wired or wireless. You'll also get an indication of how well your wireless links are doing, the locations in your house that are best, local interference factors, etc.
You've said that you don't live close to others but you might want to see if your router has features that will either auto select the best channel(s) with the least interference or a method of letting you see the radio spectrum to make manual channel choices. (Note that interference can "local", in the 2.4Ghz band. 5Ghz is less susceptible, due to fewer consumer devices using it.)
Once you have this information in hand, then looking at SMB transfer rates might be a bit more meaningful.
I will say, as you're about to discover, theoretical maximums (802.11ax) are rarely seen in the real world.
I've run iperf between my windows client and the server, as well as between the windows client and a secondary laptop (then both on wireless) and have received 0% loss with both. To add is I've not changed any parameters, and just run iperf as it is.
I will test it again once, as mentioned, my laptop will arrive. Then I'll test both wired and wireless from different point in the house, to locate blind spots within the network.
Is there anything more to be read from iperf than how much data loss there is between client and server?
And yes, my router has a "Smart Connect" feature, where it combines 2,4GHz and 5GHz with one SSID. and chooses the best for band for the fastest transfer speeds. My windows client seems to be on the 2,4GHz band though.