I like to see Reserve Deployment work like Fast Missile Racks or Missile Autoforge, but for fighters or replacement rate. Either refill depleted wings to prevent rate drop, or boost replacement rate up 100%.
Re: Phase Mines
I think phase mines are fine as they are. Slightly unfair, but not enough to be a problem. It is certainly not Nintendo Hard like some games from the '80s and '90s. The other phase ships need systems like that (not necessarily mines) so they can brawl too instead of being playership-only strike platforms. If I have a gripe with mines, it is that AI can be a bit careless and place mines too close to allies - or itself - occasionally. One time, I forced an enemy Doom to kill itself with its own mines.
I think what could be aggravating to some is not there is no counterplay, but the counterplay can be dull (or frustrating) to them... or counter to default AI combat behavior (which means more micromanagement to rein in your AI), which is probably deathball your fleet and wait until Doom runs out of CR or overextends and gets fatally punished. Trying to chase a Doom, or letting your overeager AI chase it (without spending CP for an emergency escort), will probably result in mauled ships.
Re: Recall Device
Player without carrier skills abusing this system is not much better than a carrier officer unless the Astral is close to melee range of its target. Player with carrier skills abusing this will wreck fleets... but not as well as a Paragon with a good loadout piloted by a combat specialist.
Re: Gladius
I have considered Gladius a more expensive Thunder knockoff without the EMP. It is fragile for its cost.