I hatched the egg and got it the extra 5% milk bonus, put that on then switched to the 5% extra click. I kept switching back and forth to see which one was more beneficial to me. I noticed that every time I took off the milk bonus, my cookies would be lower than what it was before I changed to it. Ex: 2000 CPS (no milk bonus) > 2100 CPS (with) > 1900~ CPS (after taking it back off). I kept doing this until eventually my CPS was down to the thousands when before I had it somewhere in the 100k's.