I hope balance team considers doing something about the unit, in my opinion more is needed than just "fixing" the underwhelming ROF vet, but the final decisions are obviously not up to me. I provided all my arguments against the current M10 and leave it at that for other discussions.
I'm thinking about switching around Flanking Speed and HVAP. So HVAP would become the standard ability like on the 57mm. Because flanking generally sucks in CoH2. Then it can have better frontal engagements against mostly the OKW P4J, but not really anything bigger, and it would be behind an additional pay wall to keep its 80 fuel cost in check.
HVAP will help but it's not a straight up improvement (which could be dangerous with a vehicle this cheap). As it stands it needs to reload the HVAP shell, so unless you time it perfectly after a regular shot it will cost you some DPM, and can then fire only 3 of them at vet 0-2, before needing like a 10 second reload to revert to normal shells. The latter is because it will load the fourth HVAP shell for about 4 seconds before the ability runs out and then it will have to reload a regular shell on top.