I have answered this repeatedly already. Peter has never...ever read anyone's mind. It took Parkman an entire season to be good at it and that was with him only concentrating on how to get good at it. You need to accept the fact that Peter is overall more powerful but less skillful than the other characters.
I don't buy that really, but I accept your explanation. I think people try to make it fit so that it makes sense, even if it's a major plot hole.
I mean, Peter can do a lot of things that aren't his native powers and the second Parkman showed up, he was able to fight off his mind control and even turn it against him.
I don't see him as being less skillful at all.
He easily turns invisible, flies, etc. But mind reading is harder? Wasn't hard for Parkman, only to tune out all the sounds he kept hearing.