For some reason, melee kills and space kills during the ambush period are not advancing the Warrior’s Blood (stuck at 719/1000) and Hunter’s Instinct (1721/2000) counts for my KDF Recruit. I’ve tested in all scenarios where the kills are absolutely qualified (not being stolen by away teams, others, etc). Tested with all types of melee weapons and large groups of space enemies killed right after coming out of cloak.
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As for the Ambush kills you have to kill the enemy within ten seconds of breaking stealth, any longer and the kill won't count. It is best to use the ship you got as part of the event reward as it allows you to fire your torpedoes while still under cloak, then break cloak and lay waste.
I find the Borg on Defera the best place to get melee kills, turn off all your auto abilities though, no grenades, no exothermic fire, no drones etc The only issue with defera is that you kill the drone, not the guys sitting on the turrets they can steal your kills. And don't have an away team with you at all if you use Nimbus or the Dyson Sphere, it might not look like they didn't steal a kill but they do.
Check your traits too to see if there are any that might kill an enemy like the Zhat Vash Venom as that will steal your kill too.
I realize you said you have done many of the things I suggested, but I thought I'd mention them anyway just in case.
Also I find it easiest to use a tactical officer and use the sweeping strikes and lunge modules. I go to the Stronghold area on Nimbus, unequip weapons from my away team, use up on the d-pad to get them to stay in one place, then move from one group of bandits to the next using my Kirk-fu on them.