Welcome to the fold Doug
I dumped ICNR in favour of taking dark frames a while back. Why? Because I was getting better results, simple as that. Normally I just take a bunch of light frames, then at the end of the run the cap will go on and a chain of darks will be taken. However, occasionally depending on the temp, I will pause the lights run to take darks, then take more a the end. Sinch!
Michael