Round and Round

My poker play seems to be horribly cyclical - I play a particular format, I have some repeated success at it, and then I start to lose!

Trying to look at it dispassionately, I think I have put my finger on the problem - Confidence. As I gain confidence, my play seems to loosen up - the tight-aggressive play that brought me success in the first place goes out of the window - I see more flops. call more raises, get involved more. Of course receiving some fracking awful cards like I did last night never helps, and people calling my KK all-in (flop 752 rainbow), they show 8 10 off suit, and turn and rive bring 6 9! But enough of blaming the cards - When I'm playing well I can make something of crap cards, when I'm playing too loose, the best cards are useless, as I devalue them by playing too many marginal hands.