You did say even the "devs" think the AT for the ostwind is subpar for its cost. To me that reads its to expensive or to weak in that area for its cost and needs to be changed.
I would suggest you focus more about what has been actually posted than trying to "guess" things that I have not actually posted. Comments more about redesigning the unit instead of buffing it.
Live its 100 fuel imo 80 fuel is too cheap. Puts it to close to the su76 while being able to tank 4 at round compared to the 3 on the su76. If its 90 fuel that would be best.
Also imo its the p4's ai wich is a tad to good, killing 2 models with just its main gun is very common. This probably is because of its 3 mg's wearing models down. Together with its decent at power makes the p4 basicly a no brainer if one needs to chose between them.
Buffing the ostwind vs lights makes it to good of an allround unit. Lv will be played less, but as you say the su76 will be a excelent choice to counter it. But will still be a liability later on as it doesnt scale well enough.
I am not sure if was clear enough. What I actually suggest is not that the unit should has its cost reduced but be "balanced" around 80 fuel. That means that is current performance vs infatry should be lowered to much the new price. (similar changes could be done with Centaur although the centaur/AEC combo might prove too good)
The reason I suggested 80 fuel is that the bigger the fuel difference with PzIV the bigger the window of opportunity for the unit to pay for investing in it.
But this thread is about adding suppression and we are drifting of topic