The problem might be Illustrator, since it sometimes processes files based on page size and changes the scale.
Also you are assuming that the wmf is correct.
Possible solution is to rescale the vectors exported from Illustrator using the edit -> reshape -> resize, command in AC.
edited to clear up my bad inglish grammar
Eduardo Rolón AIA NCARB
AC29 US/INT -> AC08Mac Studio M4 Max 64GB ram, OS X 10.XX latest
another Moderator