Ok, more weirdness. I'm the guy who had the loose-fitting P65 on the Alpa, which fits darn well on my DF645.
Tonight I took home the dealer's demo IQ180, and it fits marvelously snug on my Alpa. I have the "00" Phase adapter. This IQ180 fit so snug on a DF that two of us wouldn't even force it on. Eventually one of the guys did get it on the DF. This is all backwards from what others have experienced except for JLockard above.
Dave
Very interesting. So far, you are the only person I am reading reporting this, both here, and on LuLa. If I am understanding this correctly, you have anIQ180 that has the same dimension plate as the P65+. All the problems so far seem to be of loose mounting IQ180's on the oo adapter, not snug. All reports so far are that the IQ180 fits perfectly on the ooo (Leaf) adapter.
This, raises the worrisome prospect that there are not one, but two different mount dimensions on the IQ180's. The solution was always going to be easier to find if the mounts were consistent. It's a little more confusing if there is variability from back to back, though it would be fair to say that the IQ180 you are talking about has no problem as it fits the mount that holds the earlier Phase One backs properly.
I have been told by Alpa (I was at their Zurich office this week) that they are trying to find a less-expensive solution for Phase/Alpa users upgrading to IQ's, instead of having to buy a brand-new ooo adapter. It would appear from Dave's post that, happily, not everyone upgrading will have this problem.
I can only hope that IF the problem is a manufacturing problem on the part of the parts supplier who makes the mounts for Phase, that this can be tightened up quickly.
Cheers,