I think the additions work well. There were a couple of editing issues, though:
Her engine power impressived everyone involved, as did the remained of her scientific and tactical systems
"Impressived" should of course be "impressed". As for the second half and the instance with "remained", it looks like just an editing issue, I'm not quite sure what you wanted to do with it.
By the way, reading that segment again made me a bit curious as to whether or not there's ever a resolution to the ship's warp turbulence. I don't believe you explicitly mentioned a fix for that, it might be a nice touch to continue in the vein of the ships receiving upgrades to remain the backbone of the fleet. On the same topic, I looked back at the section about the Enterprise-B and it occurred to me that a mention of the extra impulse engines might be worthwhile, I noticed you had mentioned impulse performance issues earlier but only vaguely mentioned the Enterprise-B variant's upgrades, so it might help to flesh things out a bit.
By the by, any idea in your mind why the impulse upgrades wouldn't have become standard, if not the other attributes of the variant? I'm thinking something along the lines of either the added bulk throwing off the vessel's performance, the need to cut down on the space used by the engines, or maybe just an improvement in impulse technology that made them unnecessary.