Stick with it buddy and don't stop learning.
I don't know if this is mentioned on this site, but try to put it this way.
To be a professional hockey player you must first know the rules of the game and how to play, right?
Well, I know how to play hockey, and I know how to skate, but there is no way I could be a pro. Why? Because I haven't trained to be a pro.
So, I go through 10 years of training, and now I'm pro level. I get a contract to play for the Detroit Red Wings. I think, damn, I'm on my way to kiss the cup!
I figure, I know how to play the game, I'm this good now, so I'm going to stop training and just play.
What happens to me? I slowly start getting worse and worse until I get traded to some crap team like Pittsburgh. Then Pittsburgh, despite being such a crappy team, sends me down to their farm team and I can't play in the NHL anymore.
Judging by then numbers you showed, it looks like maybe you got the skills to do well in poker, then stopped learning. You followed the advice, then thought you were doing everything the same, but you weren't.
You didn't keep your skills sharp and thus started making mistakes.
Go back and read all of the articles over again and spend a bit of time every day reading about how to play.
What I am going to do (I am in a similar situation) is spend 3 hours a day reading about how to play and about 1 or 2 hours playing. I'm sure I will end up switching the times spent on both eventually, but not for quite some time.
Good luck with everything!