All of the windings in the motor should be a nice copper color. If you see any blistering or darkening of the windings, then the motor is toast. And as stated, HK looks good from the outside, but once you are in the door and holding the items in your hands, your perspective changes.
IMO, I would get AT LEAST the Align 35a ESC and Align 450MX motor. Awesome power combo that will serve you for a long time.
As for your tail, if you have checked everything in Lee's sig to make sure everything is moving correctly, make sure your blades are on correctly. It's easy to get them backwards. Have a look at Lees pictures for reference. And remember, when looking at the heli from the right side, the tail blades should be going CCW. also, make sure your main blades are on correctly as well. If they are backwards, it will have a HORRIBLE vibration and want to 'pop' into the air. We have seen this in action unfortunately here on the forum.