nice write up, i have realised in hindsight that fleet ambush on the glad list is a big no no, however on the reb list i originally posted i think its still valid choice. it nigh on puts at least 1 of his ship in your gun range from turn one. 2-3 ships firing at it kills it by turn 2 normally
The issue is still that they can easily outgun you; Nebulons in particular don't get much stronger beyond Red range. As the player with initiative, I'd be more than happy to set up an ISD and Demolisher right in your face, since I'd get to activate both and [probably] kill a Neb, possibly even your flagship, before you even get your second activation off.
I find Fleet Ambush is an objective that puts WAY too much control in the 1st player's hands, which significantly reduces any possibility of 2nd player maintaining an advantage. Sure, it could work great against an inexperienced player, but anyone who's been around the block a few times knows how to deploy for Fleet Ambush to either negate the effect (ie. deploy some Corvettes sideways as far back as you can, or deploy in staggered formation with speed dials set to meet up on turn 2-3) or ruin your day (any close-range brawler fleet that would normally have to wade through a few turns of getting pelted by Red dice suddenly appears in your face).