Dude in no way can you counter an early centaur effectively. It can drive over teller mines without setting them of, it can kill double paks in a matter of seconds, fausting it with your grens will simply lose you a squad.
I've had my Centaur get engine destroyed by Teller Mines in 2 games so far. It isn't immune to mines.
You can get a Stug out quite fast last time I checked it costs 280 MP and 80 Fuel. That is easily able to be gotten out faster than the Centaur even with teching. Just because infantry can't counter the hard counter to infantry doesn't mean it's unbalance I mean fucking really. Trying to snare a anti infantry vehicle with a Panzerfaust is one of the dumbest things I've read so far... in what universe is it good gameplay to allow a unit to hard counter it's hard counter?
Balance is needed for all factions, this includes adjusting Axis, but also your precious Allies.
My favorite faction is the Ost Heer actually, playing them against the British I know how much they can destroy the British early game and starve them of fuel. Actually I'd agree that their late game is broken, but that's more because of the Churchill tanks than Centaurs. Target weak point destroys Centaurs now because of the stun. It makes Paks and Stugs really strong in a stupid way (stun locking) once they change target weak point to weapon destroyed on penetration I reckon that Paks will continue to be very potent if microd effectively.
I sense much fanboy in you, which is a pity. Just be realistic, even your favorite Brits and wet dreams need nerfs.
I play USF and Ost Heer the most with British starting to replace the USF. I've told you the nerfs it needs but people who think that the Ostwind needs a buff are being unrealistic.