FSX installed in Windows 10 and have a problem with landings.
None of my planes show any RPM drop-off when closing the throttle. They continue down the runway and overrun the airport! It also seems that the RPM's should go higher. I didn't have the problem with FS9!
I'm using a Saitek EVO stick - is it possible there is a problem with the throttle on the stick?
I would clean out all the old drivers that you have and load the new ones.
Also read the manuals that are available here.
Yes, your stick itself can be the problem, no one is building hardware that lasts a long time anymore.
They would rather sell you a new one than build a good one.