no-limit heads up play

[cincy_kid24]

I have been having trouble in heads up, no-limit situations lately, my general feeling is to steal blinds like crazy and semi-bluff (applied to any tourney structure). Also by this point I have solidified a tight-aggressive image causing my opponents almost always raise with the best hand and become very predictable. This kind of strategy has worked fairly well for me in the past but for some reason ive been getting caught, maybe i loosen up too much during heads up play which affects my decision-making. What is the best way approach heads-up for no-limit tourneys?