I have been using HC-110 mixed from the "syrup" for years with good results. I use a dilution of 1 part syrup to 31 parts water. I use the mixing water to rinse the small graduate that held the syrup to make sure it all gets dissolved, then top off to the final volume.(posted 8903 days ago)I have processed two 36 exposure 35mm rolls at a time in a 1 pint tank with that mix and had good results. I think 1 roll of 220 will have about the same surface area, so I dont think any adjustment would be needed.
As for published curves, probably Kodak would be the place to look. Yours will vary according to your agitation procedures, time, etc. I dont know that I would be all that worried about it. I have simply tuned things by finding development times for 3 basic lighting situations until they print on a normal paper grade (I dont use multi-contrast papers) with my enlarger or contact printer and then try to repeat as carefully as I can.