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It takes time. Try playing a game then mw3
The servers are still bad.

But is my hacked accuracy affecting it? Or kdr?

No it is not affecting

Don't bother any (-)0.00 your prestige won't go on mw3 i have the same kind-ish problem with my score cus it toom high and if i haven't played mw2 in a while it doesn't show me on my friend list .
This might work reset your self everything 0 go back to mw3 wait about 2 hours then back to mw2 rank your self to 10th but make not too high stats then go back to mw3 and wait