Andrew, thats great!
I agree with the removal of +1 boarding, altough I'd expect a DShip to be something like a frigging daemon nest, not so easily boarded
About the "no scatter" i'm not so convinced. If the ship can move when spectral, even the turn it appears on the board, we should give it a chanche not to always appear right in the back of any ship. Especially if it has a chanche to retain full firepower. Besides, I can agree with that. (let's love the DShip)
The reduced repair chart is good. A little bit too harsh maybe? I'd say
1-2 nothing
3-5 1 hull point
6 2 hull point
-add +1 to the roll for every turn the Daemon spent in the Warp after the first. (this might be excessive if paired with faster crit repair)
I don't know if the bonus on crit repair is maybe a little too OP.
It depends on the final cost of the upgrade i guess.
Limitation 25% seems legit. Demon upgrade cost comprehensive or not? I propend to make this limitation on the unmodified ship cost, as per statline.
About the rest, i'm with you.
To recap the ship will appear using the "slower" way ( No more fast reappearing if i read right,
), but may retain full firepower, when spectral the MoS is cumulative with the "haunting" thing, smaller repair chance , no conceding points BUT if they crippled you once, you concede VP even if you repair, considered disengaged only if effectively disengaged at the end.