For a muzzle brake to be at all effective, the gas must be released behind the bullet. Behind the bullet. I repeat this for effect.
Recoil has two phases; that which is caused by bullet travel within the bore, and that which is similar to rocket thrust after the bullet emerges.
The brake can only go to work after the bullet is gone, The rifle will still jump to whatever degree the first phase imposes; the rifle will jump less, but the effect on the target should not be any different because the bullet was on its way before the brake would, or could, alter the rifle's behavior. .
I find that my experiences with muzzle climb have all been most relative to stock design, notably the position of the butt pad, and the position of the shoulder in contract behind it. The lower the shoulder is in contact below the bore axis, the more pronounced will be the muzzle rise.
Get the shoulder as high on the butt pad as you can, then see what effect this has on muzzle rise.
There Is a way to anchor the bipod to the supporting surface. It involves putting the upper body's weight to work.
Place a sling under the rifle, anchored fore and aft, in addition to the bipod. Pass the other arm (left if you are a righty) between the rifle and the sling, and adjust the sling so that in the prone position, the elbow is supported just barely clear of the supporting surface, grasping and guiding the butt to aim with that hand.
This way, when the rifle recoils, the upper body's weight acts against muzzle climb.
Now I realize that you have already mounted the brake and are happy with the results. But muzzle brakes are not permitted in NRA sanctioned competitive events.
This second approach that I'm suggesting is permitted, and may be especially helpful to folks who compete in NRA competitions. I have used this technique in 1000yd F Class, and can watch the bullet's trace during the later part of the trajectory, as the bullet cruises back on down and into the target.
Greg