I've seen 45 overs haze at idle. My 45 over SAC's hazed until I redid my tuning. The big problem with nozzle swaps is most of the time it's a complete waste of money since the ball seat is normally worn in the body. Swapping new nozzles onto worn bodies gives you more expensive junk.99% of the time a LB7 that smokes at idle is injectors. They use a VOC nozzle that are notorious for leaking. Get a scanner on it and cancel injectors one at a time and see if the smoke clears up. Balance rates can help narrow it down too.
But big oversized injectors can do the same thing. I dont see hazing with 30% overs. But if someone put something like 200% overs in it that's might be your issue.