Breather reed flap

The oil your getting blown out the breather is from "blow by" (worn piston rings), or a worn/damaged cylinder.
 
Compression is getting past the rings, into the crankcase, then forced out of the breather...
 
This can be confirmed by doing a leak down test..  You'll hear/feel air escaping from the combustion chamber come out thru the oil dip stick.
 
I just had a 6.75 Briggs, same thing.  I tore it down as I needed the crankshaft out of it..  The ring end gap looked good but there was some pretty bad scoring on 2 sides of the cylinder bore.   That was apparently causing my blow by