One of my mains is a Bio/KM tank, though I played KM on brute as well. Not trying to convince anyone that it's actually secretly really good, but I've managed to get enjoyment out of the set once I changed how I was slotting my attacks. Before I would just 6-slot with whole sets, but now I'm loading up on +recharge procs everywhere I can put them. On KM, you have several good places for those. That along with a couple of damage procs in every attack. I skipped Concentrated Strike altogether.
Between the single target attacks, the cone (slotted with KB->KD), and the PBAoE, I'm constantly reducing the cooldowns on my longish Bio powers, and Siphon Power of course. My recharge is high enough that the PBAoE and Cone are a complete attack chain. Also, the cone is just fun to use as you approach a big group of enemies, feels like bowling.