Different timers for the ults, as they are all on the same timer.
Recovery Link should have the shortest, it's meant for recovery in an engagements. Being able to find cover at the last minute.
Survivor Link should have the longest, as it is now. It's meant to move faster, possibly escape. Using the really more as a last ditch effort but unable to be used more than twice in ANY group in PVP, in PVE all bets are off keep them unlinked.
Tactical link should be somewhere in the middle of the others, as it's damage and you want people to consider using it in tandem with Recovery Link and staying IN the fight, vs running away.
They should be much more viable in long lasting TACTICAL engagements.