For a deceptive flight to work, you need 3 things. First, the flight simulating bombers needs to be tight and slow (looking like they are gaining alt). Second, it works much better if another flight RVs with the first flight ( on enemy dar). Lastly (and most important), the numbers have to be correct.
If the enemy takes the bait, then you have isolated enemy fighters away from the "real" target. If they don't bite, the reverse is true in wasted assets. That's the nature of the beast, a deception cannot be strong.
My 2 cents