So 2 centaurs barely managed to take down P4 at point blank range? You realize with centaur speed thats impossible scenario as it's much slower than P4 and has much higher pen drop than Ostwind.
Now try using that brain of yours and do the same test at med or long ranges.
u did some test at long range with ostwind ? no u did nothing
ostwind lsoes 15-5 pen at long medium and low
Penetration near
55
Penetration mid
40
Penetration far
35
centaur loses 5 pen
Penetration near
30
Penetration mid
25
Penetration far
20
now 5 >15 great logic
and in a realistic scenario tanks move, guess who has 100 % accuracy on the move vs tanks ? spoiler not ostwind