I've never made these "milk rolls", but I've made a fair amount of bread over the years, including a batch of sourdough whole-wheat bread two days ago. Quantities in bread recipes are always approximate, and vary with temperature and humidity and phase of moon. I've usually had the best results on rainy or very-humid days in the summer. If it's too soft and sticky, sprinkle some more flour on the kneading surface and knead until it's incorporated. If it's too firm and stiff, sprinkle some water or milk on the kneading surface and knead until it's incorporated. Some cookbook author said the texture before rising should feel like your earlobe.