I did everything you did on your pc...and the game still plays like EA crap. I am disheartened by EA at this point, this same issue has been going on for months with no fix. You might also want to consider the following, :
*Make sure to uninstall the game and anti-cheat properly, before reinstalling. For some reason, the game and anti cheat dont completely uninstall properly for many.
*In the installed apps section of your system, make sure only necessary apps open up at start up.
*Defragment your computer and optimize your hard drives.
*Launch the game, then go to the task manager. Right click FC26 and prioritize power management for FC26 with your GPU. ( you might needs admin privileges) This gives FC26 game priority to use gpu over other possible open items.
*Verify your graphics card max frame rate by using the model number. Then make sure the frame rate doesn't exceed your graphics cards max rate in the game settings. Most put it 2 to 3 frames below your max on the fc26 game settings.
Good luck.