How to prevent blisters from drumsticks?

So for a while now i have been getting blisters on fingers (and no im not Ringo) from drumsticks. I use drumsticks with a dip for added grip, since the drumsticks tend to slip out of my hand alot. I have a feeling this is what is causing the problem, but i can't switch from those types of sticks. Should i change the way im holding the drumsticks? Or something else?