overthinking Star Wars

Okay, so the second Death Star is open enough that you can fly a YT-1300 right in, and destroy the reactor (I'm going to assume that if Death Star II had been completed, its vulnerability would have been limited to a similar unshielded 2m diameter exhaust port leading to that reactor). The Emperor himself is going to be on that Death Star.

All of this should be screaming it's a trap and depending on how desperate the Alliance really is, they might have reconnaissance about Imperial troop movements. I'd figure that the smart and less dramatically heroic thing for Ackbar to do is to use his recon to figure out where the Imperials are pulling their ships from, launch a small feint at Death Star II, and use all his remaining ships to hit one or two of the sites the Imperials took ships from because those have got to be big (shipyards, refineries, etc).

There are three ways which I figure the Imperials could've gotten the ships that participated in Endor;

• the task force left their expected stations at the last moment so nothing out of the ordinary would appear to be happening;
  
• the task force was pulled together from some place far from Endor, which could've led to the feint above;
  
• with a few exceptions like Excelsior, the task force was pulled from space beyond the Outer Rim, which the Expanded Universe lets us know Thrawn was off exploring, in which case it's impossible to predict where it would come from.

So now I'm wondering whether Ackbar knew it was a trap already, figured it was a chance to take out a big Imperial task force out of port, with Death Star II as collateral (he didn't know it was fully operational, it's implied that not even all the Imps knew it was fully operational, and what motivates your pilots and ground force more, saying "hey, we're going after a huge task force which is there theoretically as a trap" or "we have a chance of killing Palpatine himself"?).