hello,
is that 3/4" id or od, I am using 5/8" id from the tank to the pump and I think it may be restrictive as the 911 system uses what looks to be a 3/4" id pipe to and from the oil tank.
For you aeration problem, you could icrease the size of your retun line, maybe it is too restrictive and is causing a spray effect when it enters your tank. Low pressure high volume on the scavenge output and suction side, that means big pipes, not as important for flow on the pressure side feeding the bearings
Is there such thing as too much scavenging in a dry sump? I always thought that more is better, a vacum in the case is desireable for hp and less oil leaks
Bry