Like you noticed, trying to react to the attacks as they happen is very difficult. But Blucher's AI picks attacks based almost exclusively on your position, so you should be able to anticipate what's coming in advance and already be ready to dodge before it starts. (Slams when you're in front, turnaround hit when you're behind, smokestack slam when you're above) For the charge a good strategy is to walljump off the sides of the arena, you can also angle your hook attack upwards to gain some height.
Here's a video of the fight on Reaper, hopefully this helps some. I'd be happy to give more tips if needed.