Would you mind explaining that? Because unless I'm wrong, lower scatter means more chance to still hit shots that are 'misses' because the missed shots don't get spread out as much.
Collision hit are easier to achieve the longer the projectile travels or they can fall sort.
By reducing the scatter distance and offset the chance of scoring a collision hit is reduced especially when moving. Keep in mind that the low accuracy of the Ostwind vs light tank makes it relay on collision hits to actually land them.
This affect can easily be seen by the high distance scatter ATG guns have.
Examples
Panther:
Scatter
Distance offset 0.25
Distance ratio 1
Distance max 8
Su-85
Distance offset 0.25
Distance ratio 1
Distance max 7.5
PzIV
Scatter
Distance offset 0.25
Distance ratio 1
Distance max 6.4
Scatter
T-34/76
Distance offset 0.25
Distance ratio 1
Distance max 6.9
By lowering scatter to from 7.1 to 5.25 one is actually lowering the chance to get collision hits especially vs fast small targets.
One can easily increase the accuracy of the Ostwind and/or the reduce the moving penalty to score more "natural" hits even if doubled I doubt it will make any difference in its AI role.