I tried the modifications from the most recent commit. #824 Seems to be solved, but I'm still having some issues with raidpet and maintanktarget.

Raidpet:
The column growth direction does not work for any direction other than left. For example, the growth direction to right (the default) does indeed place the first pet unit frame in the upper left corner as it should, however every time a new column is added the growth is to the left rather than to the right, translating the first column to the left. Also when there is only one column, the starting position of that one is one column to the right of the actual starting position. This means that the first pet unit frame only have the correct position when there are exactly two columns (one column is too far to the right and 3 or more it is too far to the left).

You also have to be in an actual raid with pets to see the petframe placements, since the dummy frames created when in "unlock" mode only ever fills the very first column and does not represent how it actually looks in raids.

Maintanktarget:
Seems to be an off by one error; the second tank have the first tanks target and so on.