Ball heads on High magnification optics will drive you nuts. It is virtually impossible to make nice incremental adjustments on a ball head and the center of gravity is all wrong too. Serious wildlife photographers use a gimbal type mount, it resolves the center of gravity issues by moving the center of rotation sufficiently high that the optic is always stable.
Jobu Design BWG-J3K Jobu Jr.3 Gimbal Kit with Swing-Arm BWG-J3K
You add a mounting rail for your optic, that allows the best axial position to be found so that it is perfectly balanced.
That particular model = $329
How high do you need the spotter deployed ? Yes, the carbon fiber tripods are pricey..