I wonder if the greater part of that oil is at start-up and caused by wet sumping since last used confused2

Can't see your pictures (password error), but if exit from pipe is lower than original air intake it may increase oil and fumes into your catch device.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone