I was able to use common on your model and the outcome was nothing, which is what I would expect, given the tolerance fit modeled.
I also modified your model slightly to try to get something more exact, I used a shape-binder of SketchFins to adjust the internal surface of Cone Shell. This does improve the fit, but there is now interference at the edges of the fins, as is shown in the result of Part Intersection. Square peg Round hole
. Measuring this shows it to be 13um, maybe it could be improved by making a partial revolve of Sketch fins instead of a pad, But I suspect that there would still be some issues at the top of the fin.
Your sketching has improved, but repetitive dimensions also smells fishy...(nit picking