I used to be a pro, so I can answer this:

This is absolutely normal; it is even very good!

I consider 30 good pics out of 400 a very good result! The most important point is IMHO that you go over your shots and select. The "reflection process" is important. It is the place where you learn to take good pictures. This is what most amateurs don't do. And this is what separates you from amateurs. It's not whether you use live view or M mode. (My personal opinion is to use live view and P mode when they deliver the best results.)

Let me add an anecdote from a visit to the photokina (It was probably 1982 or 1986): There was a photographer presenting his works and they were really good stuff. He was asked the question how he does it to get that many good shots. His answer was:

I have a miracle box at home. I can grab into that box and take out a bad picture. Again, I can grab into that box and get another bad picture. Again and again and again.
This box contains all the pictures that didn't make it. And this box is usually quite full.