So I took that dive and tried multiple different presets for collision but found what affects it is actually the Parent Class of the object - and in the glitch case for me it’s only Parent Class: BuildingProp that glitches, while anything like floors do not glitch and are classified as BuildingFloor (not destructible) - for custom props you can switch this parent class but for UEFN assets you cannot - so as a work-around I’ve swapped them to moveable.
As for performance again I can’t fully answer this as it might depend on the level complexity but my map is currently running normally on a switch with my assets swapped to moveable, no decrease in performance.
