S!
Use VisibilityDistance=3 in conjunction with LandGeom=3 and goes without saying, works only in Perfect mode aka HardwareShaders=1. The popping up of towns and other items is like a ring around your plane and usually the pattern is irrelgular. How I bomb is that I align way out from target to the general direction of target and then finetune closer in as you can usually see a town as a lighter patch in the "flurry" landscape far away.
I suspect this object thing popping up very close is due IL-2 is more CPU heavy than GPU. No matter what monster GPU you have Berlin will choke your system. What would help might be that TD could assign more work to the GPU and make IL-2 code run on more than one core effectively evening out the work load for smoother gameplay in object intensive areas. Would be a great thing