I don't think Jackson needs to be moved at all if we're making it worse against medium tanks, better against heavies. If it's not good against mediums anymore then there's no reason to build one right after major unlock anyway
I would give it 200 dmg back, increase reload time slightly, and reduce HP back to 480. If someone tries to get an M36 out first then a p4 can actually punish them if they aren't careful (the way it used to be)
However, the M10 couldn't be implemented with its current stats; right now it's balanced as a single doc-locked call-in, not as a default unit. It would probably need a price increase or something.
Yeah I think the stock version would need to be at least 100 fuel. They are 90 right now iirc