You can overdo it with organics but I've found it hard to do with Dr Earth only. I messed up the math one time because I was a tiny bit too medicated for my own good. I gave one plant double what I normally use and didn't see any tip burn or lockouts. I did wait 3 weeks before I fed it again and don't recommend that you try it as some strains would not take it in stride I bet.
Once you start adding stuff to the Dr Earth in your soil it gets easier to burn them I think. Guano and crab meal and other organic additives can for sure end up being too hot just like salt nutes.