One of your issues might be "filtering". It's hard to tell without seeing an example of your writing, but if you have a lot of "he saw X, he heard Y, he felt Z" kinds of sentences, you're doing unnecessary filtering through the character POV. This is often a problem in 1st person POV, but it can be equally there in 3rd. If your POV is clearly from your protag, you don't need to be constantly telling the reader that he saw or heard stuff. The stuff happens, and the reader will transparently assume the character saw or heard it happen, because that's the only way he the protag could know about it.