Originally Posted by Eric F

There are multiple choices for manufacturers of 1x chainrings. My choice has been www.wolftoothcomponents.com. What you will find is that most chainrings intended for 1x use have a "narrow-wide" tooth profile that helps with chain retention. This is a good thing.

Shifter stiffness and the behavior you describe could be an issue with the cable and/or housing causing additional friction. However, if you want to upgrade, Shimano 105 or Ultegra will serve you really well for a long time, and will be a nice upgrade in quality.