Not based on anything except my personal experience and feeling, if I'm getting stronger I'm going to be sore, but not super sore. If the DOMS lasts more than two days and/or limits my activities, it's a sign to me that I've done too much. A little sore and tired and feeling like I couldn't go as fast on a recovery day as I do on a hard day even if I wanted to, to me that's a good thing. That's how I feel when I'm progressing the fastest.