>>3568236 If youre in here.
Just going off ilfords delta 100 tech sheet (
https://www.ilfordphoto.com/amfile/file/download/file/3/product/679/) looks like the different developers produce different results but require different developing times. Say you want the maximum sharpness you'd get ID-11 (1+3) but it takes 20 min @ 68 degrees. You can increase the temp to 77 and reduce the dev time to 12 min. I'm not sure about other manufactures though and what they do.