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222 is enough against most light vehicles with exception of AA HT (which i think it has too high anti light potential) and enough assistant to tackle light AI tanks.
Regarding light tanks, both AEC and Stuart had been made pretty average to bad regarding AI, so you don't actually need AT to avoid been steamrolled by them. It's the same as panic reacting to a Puma (Yes, the Stuart from all those is slightly better AI wise but comparable way worst at AT).
T70 is the real game changer and guess what, from all light vehicles and light tanks, it's the one which is arriving the latest.
Meta game wise, since like 2/3 patches ago, OH has been proved to be able to skip both T1 and T2 for a fast T3 Ostwind rush. 2 Pio + 2 MG + 2 PG or variations using AssGrens are common. The answer to this has been the usage of more light vehicles (M20 into Stuart/AA HT, T70) which provides a risk to the build. This result on people not skipping T2 if they are even or behind as they need the 222/Pak cause they would be too behind otherwise before the Ostwind has any impact.
PD: PG shreck is also risky to be your sole AT to depend on, but doable.
Is moving the ostwind to t2, or the HQ with a battlephase 2 requirement a decent idea? Why or why not?
Bad idea. Cause while it's a risk been without heavy/light AT on 1v1, that's not the case for teamgames at all.
I consider that while OH weakness to lights is a thing, post USF nerfs to M20 and adjustments through the years on power levels of lights, OH has enough tools to deal with them without requiring the hard counter that has been the Mobile Defense Puma meta.