Your grate having a concave shape can help to reduce the grate jamming. You also have the center part of the grate that will depress the center of the coal bed when shaked and then you shake the rotating outside grate. Never had a jam on the Golden, not exactly the same grate but the same principle.
The Sunny has a convex grate shape so more pressure to the outer of the grate and the center has no moving part...
Anyway, the time will tell you exactly the best things to do with your stove.
Mica are not so hard to work with and don't need to be perfectly air tight. Once you have replaced them, you only have to keep them clean, and if you burn the stove correctly they can stay clean for a long time. Just don't burn wood in it if you want to keep the mica clean. Many bikers spend a lot more time cleaning the bike, specially for a H.D.