I haven't the foggiest notion, to tell you the truth.

I use Actions all the time - I've set up several to perform tasks I do over and over again (duplicate Layer>Change to Soft Light>Desaturate 50 percent is one of them to give you an idea) but never with type.

When you TYPE words at 12 points for each different image, do they become different sizes? The only thing I can think of is different fonts are actually slightly different real sizes at the same point/pica height.

-Lew