Focusing on Not Focusing is Silly
In the days before I became an out-of-control addict, I found that going to the mikva was nice. Saying Tikkun haklali was also nice. But is it mainly tikkun that you want, or is it some freedom from the compulsion when it strikes that you are really looking for?
Please consider going easier on yourself. Bombarding this problem with energy often just gives it more power. The ikkar might be in remaining busy in being useful to Hashem, His people, and yourself. Focusing on not focusing on the aveiro is probably the silliest thing we can do.