Tempest may be okay. Somewhere between 6 and 8 should be fine. Scarab is a shadow of its former self with the loss of skill power and weaker Atropos. (Much rather use Tempest, possibly even Wolf, instead of Scarab today.) Shade is unimpressive since it cannot ghost tank like it used to, and it pales to Afflictor. Afflictor is almost Hyperion-nasty. Lumen is rubbish (Scarab without time shift), except maybe as a stall boat against enemy frigates with less peak performance. Glimmer is simply classic omni-shield Wolf that trades Phase Skimmer for High-Energy Focus (and more peak performance). Probably rather use a Wolf due to its escape button system.
Centurion is basically a midline Lasher. Wasn't it lowered to 4 in the last patch? With its Damper Field gutted for Mora's sake, it is worth no more than 4, or whatever a Lasher is worth.
Wayfarer is the frigate-sized Mule or hybrid. How much is a Mule worth compared to combat destroyers (9 vs. 10)? 4 sounds right.
Shade, I would put it at 6 at most. If it had its old-fashioned pre-0.72 phase cloak, it would be good (as a ghost tank), but today, it is just a liability, especially with AI squandering its peak performance and CR in record time. Anything it can do, I can probably think of another ship that can do its job either better or more cheaply.
Sunder, with cowardly AI, short-ranged energy weapons (or rare heavy beam backed by obnoxiously rare light needlers), and flimsy defenses, 9 may fine. Unlike Enforcer and Hammerhead, the weapons it wants are not so common.
Colossus Mk# are truly awful. Stock Hammerhead can murder these without breaking much of a sweat. 7 is not totally out-of-line, although the suggestion of 9 is not bad either.
Astral, yes, it should be comparable to every other combat capital that is not named Odyssey. Astral is my heavy hitter if I do not have Paragon and four Tachyon Lances (assuming I built a generalist character).