Is the HS mounted directly to the pump? I mean without a hose (vibration absorption)between the HS and the pump? If it is, the vibration of the engine could knock the valve off the seat. put a short -6 hose between the 3-way and the HS.
This doesn't have anything to do with you milking the oil, but could be a issue later.
The reason I wanted to see the pics is because i seen incorrect routing of fuel line cause big time fuel in oil. yours looks good as long as the HS and main return don't combine going into the tank.
If you have not already, might i suggest looking over the kinsler handbook, it get good around page 14
http://kinsler.com/images/CATALOG/072707/Cat56Pg_Whole_LR.pdfJoe
