I would look into custom movement mode instead of having it go into falling mode after doing the checks change it to custom mode 1 or 2 that way in animbp doesn’t go into jump anim state but instead use the custom movement mode to make it go into another sliding state and maybe use calc velocity to modify the speed, friction etc or what ever you want to do. Never tried it but I’ve used the custom movement mode for different situation like going up a ladder and is already replicated if you looking into multiplayer 
once again might work might not. Cheers!