Hi,
First of all: I love the Viggen!
Thanks Heatblur for this module! :)
I also have problems with rockets falling short in 1.5.8.
I did some testing and came up with that the problem might have to do with different temperatures.
To test it I just set up a small easy mission, starting in the air and putting the target at the old Kobuleti airfield(I think it is called that? The one that is like a little cross :) )
I put the flyover point exactly over the target.
The weather was just set to default with no wind at all.
At temperatures around 1 degrees celsius i found the rockets to be very accurate.
At high temperatures, like 35 degrees celsius they are falling short.
At low temperatures, like -30 degrees celsius they are falling long.
If someone else could test and confirm or deny this it would be good :)
Best regards,
M