+1 to the FMIC

Oil catch should be run by collecting both valve cover vents and the crank case vent (all of which ought to merge within the black metal tube that runs across the front of the TMIC). These will go in to one port of the catch tank, and the other port should be routed to the intake tube before the turbo. I can't remember about the Greddy, but ideally there is a seperator mesh between the ports on the tank.

If you're running anything higher than stock boost or have a motor with ring gap on the large end of the scale, you can expect to see some oil residue. SOME residue is normal, but if you're starting to have material collection of the oil then it can cause detonation and eventually failure.