hi jmooresshop i played with a newer version of igf, in metric ( milimiters )
it is possible to switch between tpi and pitch size, and in pitch is possible to input a number that is not an integer
i don't have experience with your machine, but i would input in igf 11 tpi, and after that i would edit the code and replace 11 with 11.5
if it would work, it means that the G code can handle a number that is not an integer, but igf uses a filter for integer
if it would not work, then i would change the arguments of the G code ... i will experiment with this tomorrow, on the machine / kindly