I love the T-5 Excelsior, I've always been a fan of the Excelsior from the movies and shows. I was as giddy as a schoolgirl when I bought it off the C-store too. I used it for months, loved it a TON; though now, it's currently sitting moth-balled while I fly around the galaxy in a Fleet Escort.
Anyways, I just think the Excelsior needs just a little tweaking.
1. Give a special bonus to the power of the ship if you use the Transwarp Computer console on it. More than just that efficiency bonus, but something extra to make it more worthwhile. I'll be glad to give up a console slot if that was the case.
I know it reduces transwarp cooldowns, and I like that, but a good Astrometrics Scientist can do the same thing at the cost of only one DOFF slot and then you can use the freed console slot for something else.
2. A small adjustment of the BOFF slots. I'd be happy if they did just one of the following:
A. Change the ensign slot to universal (probably the least likely thing to happen)
B. If not universal, then a science ensign (because that would be a great way to make the ship a great mix of all three classes)
C. Remove the ensign slot and turn one of the Lt. slots into a Lt. cmdr (my preference being the engineering Lt. if that were the case)
D. Remove the ensign slot and give us some other bonus in return.
Regardless, I'd want the Lt. Cmdr tac to stay, because IMO that's one of the key differences and advantages it has over the Gal-X or the Assault Cruiser.