Hi Alex,
I had both the 1999 version and the 2006 version on my bookshelf. But I picked up the 1999 version.
But that amendment raises the question of why the statement was changed from
"Compare V1 with minimum Mmcg. If it is less make V1 = min Vmcg."
to
"If V1 is less than VMCG, take-off is not permitted."
I recall that a CQB question on this subject appeared, and the staff answer was "Take-off is not permitted." If I remember correctly this question raised objections because it did not specify that the aircraft was at its FLTOM. So there was nothing to preclude increasing V1 to equal Vmcg.
I suspect that the amendment to the CAP was in response to these appeals. But didn't any of the people involved ask the obvious questions of "So what will the pilot do?" "Will he/she really increase the mass rather than simply assuming a higher mass?"
As you say pilot doing 20 minute turn-rounds cannot be expected to work out a range of V1s. But can they really be expected to wait until the wind pick up?
It would be interesting to hear what current line pilots do when V1 is less than Vmcg.