Nope, we just got a split sleep number bed and the gap is still significant - not anything a little moving around a little can't ovecome!
We have a sleep number as well and my number is pretty low compared to hers. So, we try to remember to adjust mine, and then it's better. But it's no fun worrying about positions as well. I'd rather just fuck. Also don't let the sleep number people take your box spring - their cheap ass piece of plastic frame is fucking worthless.