10-11min Sherman all day long.
Obers, vetted Volks + Panther or Jadgpanzer + Schwerer in the middle of the map + Pak43 - just garden me (Faymonville with OKW at south spawn with fortification is my nightmare).
in this case you need a new commander and build entirely i've found.
Infantry Company>4 Rifles>Ambu>Captain>Pack Howie(no mortar halftrack OpieOP) as soon as MP allows>M1919s>Nades>At gun for luchs,Light AT mines if i can as well,>Jackson and another ATG to prevent panther rush>Priest>TOT barrage combined for forward position assault with rifles supporting>GG
Doing fast sherman strat against fortifications is like going for stuart spam against Jagdpanzer 4 spam. Youre just bashing your head into the wall,gotta try new things even if it means losing a couple times as you adjust.
Since i started using this build/commander in 1v1 I never lose to fortification OKW anymore Unless the guy is just way better(when i used to lose to it all the time everytime.to weak opponents.)
A massive part of strategy in coh2 is Commander choice. you wouldnt go Jagdtiger against B4 would you? You wouldnt do ISU against Jagdtiger...Forward med base against katyusha?
so why gimp yourself out of true indirect fire when facing a campy doctrine? You still get M1919 elite infantry,you just lose P47(which you dont REQUIRE in most cases,i honestly think p47 reliance is noobish) and airdrop atg(you get one naturally).
The only thing is all suppression is reliant on the riflemen.(or the fighting positions they can place with this doc) You also cannot afford to lose a squad at all,and munitions is somewhat important.