I would not be so harsh on the idea of home gunsmithing,but I do agree the Dremel is best kept away with few exceptions.
A reasonable approach;Do not change the geometry of the part unless there is a clear reason to modify it.Hand polishing stones,like are used in the mold business,can improve a surface finish,break sharp edges,etc.A piece of hardwood with lapping compound can work,too.
A 1911 is not a good platform for a rookie to work in a seat of the pants fashion.The functional relationships of the parts really have to be understood.
If you want to learn,Kuhnhausen manuals,and the Wilson Combat DVD set are good guidance.
Having a ramped bbl fit seems like a good remedy.