Can we have the formula that is used to calculate a turbine's ITT?

The five parametres provided currently are:

- itt_peak_temperature
- itt_tc
- itt_tuning_constant
- fuel_flow_max_itt_factor
- fuel_flow_min_itt_factor

The only ones that seem to have a somewhat clear function are itt_tc and itt_tuning constant. However, after running tests with t least 60 different combinations, I was unable to get the ITT tuned to their RL parametres. When plotting the charts for my results, it looks as if the ITT follows specific ratios for low idle, high idle and max power, with itt_peak_temperature just scaling those higher or lower.

fuel_flow_max/min_itt_factor seemed to be what I need to fine- tune my ITT readouts, but they don't seem to have an effect.