i always go m20 against ost, it jsut so great harass their mainline infanty.
222 can never dive for the kill because of rifleman covering and crew bazooka.
AT gun can never catch it because the mobilebility and smoke.
however i didn't catch your process that ost can't go pg whit panzerschreck but have to go back T2.
can you explain more about it?
My opponent went 222 to counter the m20 probably because the m20 is an easier target to the 222 than the AAHT. And I don't think that pzshreck are really good vs the M20, I've also face it and more than often shreck are missing at max range, its quite rare to see one salvo fully connecting. The M20 is also more mobile, if you see the shreck squad on the left, just go right.