I don't have that problem of jump lag with crossfire in BC2. Maybe it's a crossfire bug, maybe it's NB volts? Sorry to add to your list of bugs
To be fair though, crossfire does have more things to go wrong.
Dunno could be driver related i tried the 10.10 had problems in black ops, So i tried the 10.11Black ops runs fine but i have the run/jump bug in bfc2 in crossfire. And 10.12 is just a total disaster really all round.
You would think newer drivers are better, but its not always the case, lots of people go back to older drivers that worked well.
It seems that when they release a card they work through the bugs on the drivers and just when they start fecting out decent drivers for that card, They bring out a new family of graphics cards and have to add support for them too, and the drivers get messed around with so much to support all these cards they start to become less stable and more bugs arise its a multi support thing i think.
When it comes to hardware and software one is always lagging behind i mean why fetch out a new game like black ops with no crossfire support? Yet cod 4 supports it and its older! Its dam annoying.
I think they release hardware too quickly and were all tricked into this way of thinking that we must continuesly upgrade.
When really if they made all games and software to run well with the latest hardware trend things would run alot more efficeintly and your pc would seem alot faster.
Like when crysis first came out everything hardware was compared to crysis and how well it preformed. And if it didnt preform well then people wanted to upgrade!!
Were as me i was like "So what i dont play crysis problem solved!" no need to upgrade! cos every other game i had flew along happily all day long. I couldnt bring myself to spend another load of money based around one stupid game that i didnt even play and was ahead of its time anyway, And even the most expensive hardware at the time still struggled to squeeze 60fps out of it maxed out.
Just stupid lol but for some it was their motivation to upgrade.