My analysis:

You play very tight, basically nutcamping. No problem there, although it isn't optimal but it should definately be able to net you over 10BB/100. The likely problem is that you can't let go of your hands when you are beat. Since you play so few hands, you're probably expecting to win every pot you enter? So you will call down your opponents' aggression with a second best hand, maximizing your losses, and not betting your own winners aggressively enough - maybe out of fear that everyone will fold when that odd occurrence happens that you have a winner? Hence you end up maximizing losses and minimizing profit. I can't see any other way how your BB/100 can drop when you play this tight..