Stuka rockets act through AOE, if two rockets hit 2 meters or less away from the vehicles the damage is 200, from 2 meters to 4 the damage is only 30.
For a Stuka to kill a medium, it requires 3 rockets to hit at less than 2 meters from a vehicle and 2 to hit at less than 4 meters. That's moronic to even consider such a case.
The only possible way to destroy a vehicle with rocket arty is to bring unrealistically close panzerwerfer and land mattress and fire on a stationary vehicle at 10-20 range.
The panzerwerfer does not have the penetration, so the rockets just bounce off. The same happens when you stuka zu fuß an IS2 or ISU152. You get exactly 0 damage.
I did 40% damage in one test when I just fired up the cheatmod, one another I did 30-40%.
This was in a straight line randomly aimed at the sherman.
If you do that in a circle, the damage would be brutal and very likely result in 60-90% damage on a medium like Jackons or Firely.
Just test it yourself, if you don't believe me. The Cheatmod can be downloaded in the workshop and is easily to use.
I play OKW myself and the feuersturms doctrinal barrage is devastating, if something is caught within the circle.
In 4v4 just like in the Bloodbath tournament you have people dedicate themselves to go for specOps + command panther + rest walking stuka like DevM going for 3+. Use 2 barrages together in a circle and you WILL wipe any medium you only wouldve done 50% in a worst case scenario damage to in one barrage.
But I have a fleeting hint you might be axis biased seeing you how switch your avatar from one german unit to another frequently.