If the only thing you touched was the points, and the advance increased from 4 degrees to 30 degrees, then the points gap is too small.

If you have the correct points gap, then distributor is installed in the incorrect position. To correct this condition, (assuming distributor rotation is clockwise), pull out the distributor, turn the rotor counter clockwise about the distance of one gear tooth, and re-insert. Now you won't have the problem of the distributor body touching something when you try to reduce the advance.

With the crank at TDC and cylinder 1 at compression, the rotor should point to a tiny mark that is on top of the distributor body.

Harry

1992 400SE
1986 325e
1974 2002
2001 CLK320