When I tried kallitype printing for the first time several years ago, I had many issues with yellow high lights. I realized that my tap water was suspect (too alkaline), so to my rinse bath (which was a big bucket of water) I added a sprinkle of citric acid. No more yellow high lights. Which paper are you using? Which developer are you using? How do you clear? How is your tap water?
With your film, have you done a max black/min time test? You can try adding a drop or two of potassium dichromate to the sensitizer to increase contrast. A DR of 1.40 is pretty low. My negatives DR's are never below 1.70.