The Demon Hunter’s nerf falls short of what’s needed. Don’t forget that the change in circlet will make DH an even stronger hero. I recommend reverting the activation cost to 20 and adjusting the DPS back to 10/15/20. The current Demon Hunter is excessively powerful. Also, it’s worth noting that the Warden is already a formidable hero, and there’s no need to enhance her further. The overall power of the Elven units should be nerfed.
Additionally, consider finding a way to buff the Blademaster.