Very nice job on that exhaust stud insert.  How did you find the procedure?  Do you feel it was an easy mod?  Your finished product looks great.

How do you plan to adjust the size of your orifice?  What instrumentation will you be using to monitor oil pressure and temp?  I have found that the temperature of the oil really influences pressure.  Just a small change in temperature makes a big difference in oil pressure.  Since I have gages reading cylinder head oil pressure at the most remote bearing and oil temperature at the filter inlet, and those instruments are on my instrument cluster, it's pretty easy to set up the system.  Will you be able to monitor those parameters while you are riding your bike?

Good call on that cylinder stud.  The corrosion was forming right on the critical fillet at the base of the stud.  That just happens to be the longest stud too.  I suspect the corrosion could get out of hand pretty fast and you would end up with a stud that was stuck in the aluminum case BIG time.  Then you would be forced to remove the engine to get the head off.  

One of your copper washers is really galled up badly.  Do you happen to know what location it was in.  Could it possible be related to the leak you are chasing?