Yes, I did not read your post thoroughly, for some reason I saw usergroupid rather than fieldid.
However, to me I think it is better to have 1 number for grace posts that applies to having to fill out any fields. For example, suppose you have 6 profile fields you have set as required via this product, and field1 has 10 grace posts, field2 has 20 grace posts, and so on. A new user would be "bothered" by the error message instructing them to fill out a profile field at 6 different times. I think it is better to bother them once, and get everything done at the same time.