.... are you sure you want to underline greater pintle MG penetration as an advantage vs light vehicles?
.... you do remember that sherman is a tank and can use its cannon to take out light vehicles and penetration on pintle is 100% irrelevant unless you're chasing 20% hp pwerfer, firing at its rear armor with main cannon destroyed.
And no, I don't find P4 underperforming at all, spamming them is a bad idea, but one supported by StuG and then whatever is needed more performs well for the cost and scales amazingly compared to any allied tank.
A 125 fuel P4 gets beaten by a 110 fuel Cromwell outright.
A 125 fuel P4 is a close fight with the 110 fuel Sherman.
A 125 fuel P4 will win vs a T34, but the T34 costs 45 fuel less.
A 125 fuel P4 gets hopelessly mocked by the EZ8 / M4C / T34/85.
The solution? Either reduce the cost to 110 fuel or buff its pen. There is absolutely no reason for it to cost 125 with its current performance.