you do need to wait for more advanced tactics for forcing three receiver sets, but there are things you can do to "help" the comp use more of them: ramp up the percentage of passes to the WR's. make sure the WR's all have the stamina to be in the game together often. and lean towards passing over running (but i dont like that one). running outside/inside percentage can be set, so lean it farther towards the outside if your line isnt opening up holes.