I think you did not read what Emate wrote correctly. He said to use the heaviest you can handle. That means that after four hours, if your strokes start to fail, then it is heavier than you can handle. But if you can play four hours with no problem, then you should try to see if you can handle something heavier. And I don't think Elargento ever said he was a beginner.
The 10.6 to 11.2 was just a suggestion - a starting point. I certainly wouldn't go any lighter than 10.0, no matter what your skill level is. Weight gives you something that no other characteristic of a racquet can give you: power AND control. Everything else, headsize, string tension, length... they all trade one for the other.
There is also no need to buy a new racquet to see if extra weight will help. You can always make any racquet heavier by adding weight. I always look for racquets that are slightly lighter than I really want, and then add weight to make them exactly what I want. Experiment with different weights, strings, and string tension. You can probably make the racquet you already own much better for very little money.
But in my honest opinion, save the money you would spend on a racquet and take lessons. A racquet will last maybe a few years, but the lessons will last forever. If you often hit the frame, then there is something wrong, and no racquet will change it - but a coach can.
I used to always hit the lower side of the frame when I tried to hit heavy topspin. I'd aim for the center, but hit the bottom. So my coach told me to start aiming for the top, and I started to hit the center. It wasn't that I couldn't control the racquet - even though I was hitting the frame, I was consistently hitting the same spot on the frame. The racquet simply was not where I thought it was when I made contact, but after enough time, I trained myself to know where it really was. That's what a good coach can do - he can see that what you are really doing is not the same as what you think you are doing.