I'm a bit uneasy about the idea of tinkering with the Maxim again. We've been down this path a couple times the past 2 1/2 years. I personally believe that the Maxim is being used as a crutch for cons rather meh performance. Further, by buffing the 222 aren't we buffing a direct counter to the maxim? The rest of the changes look pretty great.
i think that's debatable. HMGs in general are soft counters to light vehicles (although MG42 incendiaries bring that into hard counter territory) but their setup and tear down times mean that only works if the light vehicle can be kept away from the HMG. with con's AT nade they can effectively screen for a maxim and if a nade does go off the maxim will fairly easily finish a 222. a good flank will force an HMG to move though. i also didn't notice any change to the 222's damage, which is pretty weak at the moment against infantry.
i guess my takeaway is that the buff will help the 222 against maxims but i don't think it will make a significant difference most of the time, particularly against maxim spam which people seem to be having issues with.