Wirbelwind has actually ruined the fun in flakking, since before no one respected the Ostwind, thus it was possible for a good shooter to have fun in it. Now that all fear the Wirbelwind, not too many taking chances on running low/trying to take out a flak with guns. Which is more realistic, as far as that goes.
Those who are able to kill in a Wirbelwind now would probably have been able to kill in the Ostwind, back when you could see out of it, the 4x20mm setup just inspires alot more confidence for some reason.
If the Osti views remain the same as they are now, the Wirbelwind must remain unperked. You can't even see low airplanes in the Ostwind anymore. Looking at pictures, I cannot see the physical difference between the two vehicles that causes the views to be so different.
If the Osti views are modified, then five points for the Wirbel might be fair, if nothing else so people will still learn to shoot in an Osti. Then when they buy the Wirbel, they'll be able to REALLY mess up the low cons.