I would like some help on how to fight in the late stages of the game where both you and the opponent(s) have a maxed out fleet.  It seems that whenever it comes down to this stage, I'll have a larger fleet and i'm decently up the research tree but it seems that the games will always end up either in a stalemate or with me on the losing end.

I play Vasari, I expand early, I go for Dark Fleet, I upgrade my Fleet logisitics when I need to in order not to waste resources, I have my mining research maxed, and I have 2300 fleet capacity that's maxed. I SHOULD have an advantage.  I just can't finish those late game fights :/

REPLAY

 Above is a 7 person 11 star system FFA (someone dropped early) that I was in (I'm Rienke) and in it I was in the Empire Lead for the most part and the Military Lead for the entire game.  When it finally reached the last battle, I was unable to eliminate my opponent.  We were both sending what we could into battle and it seems he was winning towards the end.

3 points that may have affected that situation:

1) There was a constant bug where I'd order a fleet to move to another star system but they'd get "stuck" at the star they were at.  Didn't matter how long I'd wait or how close they were to the star, a fleet would just randomly think they'd have to move closer to the star before they could go to the next system.

2) I shoulda been more aggressive but the above glitch made things a little hard for me :/  I still think if I had been able to attack his homesystem like originally planned, I'd have won.

3) When I attempted to focus fire kill his capital ships (He had about 5 originally) I only managed to kill his lowest level one (6?) and failed every other attempt.  Why wasn't I able to kill his capitals?

Anyway, I know those three things gave enough time for my opponent to build up a proper retaliation but it doesn't change the fact that I couldn't kill his fleet :/  Any tips?