Cost could use adjustments if it's too good, but I don't think light armour would be in that much trouble outside of the scout cars and AA HTs which are other issues pertaining to the design of those tiers and not the 222. I will say it again. We can't compare the 222 in a vacuum but we also can't assume everything would be completely static.
And what's wrong with it being reliable in all match-ups? Are T-70s and Stuarts not seen in both match-ups along with the AEC against Ostheer and OKW?
They're seen because Sov and USF need them to stay on the match, not because its cool to have them. Ostheer doesn't need a better 222, they already have powerful tools to manage different aspect of the gameplay. 222 is one of those tool, unfortunately 222 counters stuff that are not meta today and guess what it is also because 222 has been over-buffed couple of months ago already. The unit is too good for what it cost and this lead players to not use scout cars anymore vs Ostheer.
What you achieve with your changes is leading players to definitively leave scout car play and adding in the list light armor play. But no worries because you decided to included a increase dps vs infantry as well to be sure whatever Sov/USF/UKF player decides to do, you just need to field a 222 and here we go, countered!!!
You just lost the notion of unit usage and dedication balance and weakness and the point that increasing the cost of a unit to compensate its potential OPness doesn't work
at all.