Everything after 2nd gren/rifle is in favor of Ost, unless you want to go for sniper, so nothing is really delayed.
That matchup seems pretty well balanced to me atm, simply better one wins(trying to grenspam against USF is the opposite of 'better').
Just Katitoff being Katitoff, USF vs Ost is hands down WTFpwning Ostheer T1 in first 6 minutes. Ostheer can only gain the advantage back after Pak and LMG42.
Using very little number of Grens in T1, relying on good defence of support weapon, making a stalemate at the time interval of the USF OPness, after T2, swarm them back with Pak and LMG42 seems the only way to play. If Rifles can bleed Ost a lot of manpower, the Pak will be delayed a lot, the super early M20 gonna kill everything.