Sorry I didn't get here sooner, but you need to replace that carrier. It's toast and your fix will only wear out the cam on the lever, then you'll get to replace both. The way to fix this "Before" it needs it,,, is to put a radius on the point of the cam on the lever. .
Goto
www.leverguns.com and read the instructions on how to do your action job, and you can omit the things you don't want to do like if you were building a CB Action gun. I don't know about your other sources on this,,, but Leverguns.com is THE definitive source for everything there is to know about them.
It mainly is deburring and breaking edges. One other area is to sand the tool marks out of the groove the ejector rides in. The last thing is to radius of the top edge of the hammer where it contacts the cocking cam on the bolt. The cam must push the hammer beyond the sear during opening which it will do anyway, however the hammer also has to be pushed down that far when closing the lever, and that is where the resistance is. Radiusing the hammer face will help that out.
And did you chamfer you chamber mouth?
See the sticky above on this.
Hope this helps,
Randy