Encountering Grover in long range open spaces - don't PEEK around the corner.
Good Grover players throw axes preemptively and you can take a lot of damage. Use short sprints between cover. This way it's harder to predict where to aim.
Use your "CC reduction" card + "Resilience" to deny point pressure from "Grumpy Bomb".
BK feels relatively safe you while stunned. "Jumping out" of stun earlier, works like surprise effect & confuses him.