I tried a set of TDR reeds in my RD350 once. I had a very hard time getting the reeds to lay flat on the cages. I got them to about where you describe, and put it all together. It ran like shit, so I took them back out and put the stock ones back. Someday I'll try some YZ reeds, which can be trimmed to fit RD cages. I know that some folks have had success with TDR's, but I also know a lot of folks who have had bad experiences with them. I'm assuming you're working with TDR's?
I wouldn't bring her home to Mama, but Mama ain't home tonight.