I'd also try to stick to a tactic and make slight improvements,work on it instead trying to get loads of tactics.Sometimes little tweaking makes all the diference.
i have the exact same problem. For the past couple of months ive been on just about every football manager forum looking in the tactics sections for any kind of useful information. I think the main problem is that i just over-complicate things. its a difficult thing to get right, therefore im starting with a basic 4-4-2 using the TC without changing anything and i'll tweak when i see fit, this seems to be the best way to deal with the problem IMO