Another Varjo Aero user here.
Can confirm points 2 and 3 from the OP.
Regarding the disappearing objects in DCS (point 3), I find that when I change the angle with which I'm looking at the object, it will reappear. For example, in a P51, if I'm looking at a plane through my gunsight, it may disappear, but then reappear when I lift my head a touch to see it through just the canopy. I find this is also true for smoke and fire effects on the ground.