Using blend trees on a portion of a Generic animation is giving me stutter

I have a generic animation of a drone. I am using a blend tree to animate a left and right turn which works fine. But the spinning fans slow down and eventually start stuttering and sometimes even stop when I am in the "left turn" or "right turn" animation. The animation works fine by itself. Any ideas?

 

If you show your blend tree settings and a video of the issue it might be a little more clear. Off the top of my head - blend trees act a little funny when not based on speed or other type of 'variable', height, distance etc etc, although a turn radius sounds like an acceptable variable. Maybe having 3 states in the blend would work better, forward, left and right?

Or just scrap the blend tree and use 3 states forward, left and right with nice transitions.

 

I think I might just stick with a movement from "idle" to "forward" and just manually rotate the drone. But here's a video of my issue. Again, when I move the drone to the "left" or "right" the propellers just stop.