Ive also been adjusting my play based on this theory. For me its been working well but I havent been as unlucky as you.

The first one is a fluke you made the right move ok if you had played it the old way circumstances would have gone your way and you would of cashed in third. However you would have had little chance of finishing any higher than third. The second hand you were corect aswell. You have 2200 and the bb is 400 if you make it eight your committed anyway with only 4xbb left theres no way you should be doubling the bb here or folding if reraised.
I was losing a lot of chips late on by raising the blinds from late postion with a hand like aj and having one of the blinds call then I make a contiuaton bet and he will call with any piece of the flop or any draw. Then Im left with the option for bluffing for all my chips other times I would get reraised and I couldnt call. I think if you employ it over a longer period of time you will find its benefits. I certanly find myself finishing on the bubble or in fifth less frequently.

gl