My 52 Shadow had similar leaks from the following areas and the following solutions:
Oil Feed line gasket - V3 gaskets above and below making sure that part was not caved in on top by making screw to tight.
Oil fed line junction - Replace oil feed line or re braze the junction or replace herringbone flex oil line
Tappet covers - V3 gaskets
Head seal - re-torque head to 30ft/lbs in stages - Actually needed the motor rebuilt in my case
front Cyl ex push rod tube - V3 gaskets Oil blew around from the RH side from the tube and down the mag cover...
My bike is far from oil tight but it is getting better every year by just keeping after it and hunting down the big leaks and then the mid sized leaks and then the small leaks..It is grand way to get to know your bikes better..
BTW +1 on he clean and dust with baby powder idea
Cheers,
Eric