New boss battle: it's cool, but needs balancing!

After the update, I decided to play through the whole game on realism, with realistic movement and balistics on. It's been a blast! I love the remastered levels and all the new little details, and the guns feel really good. I breezed through the castle, arrived at the final battle, grabbed my snooper rifle to tick at the boss like I usually do, and... oh boy, those shield duded are speedy. The animation can barely keep up with how fast they are, and they swarm you fast. That's okay! I'll just rush and run circles around the boss, unloading every gun I have into it. Now, I read about the new enemies that will shoot at you from outside the arena, but I didn't expect to have sniper-like accuracy with every single shot, even when you're running and jumping. The arena has some cover, but if you run on the ground outisde the center to reach the boulders there, armored ghosts will begin sapping your health in an instant. You can't stop to fire at the snipers, because the zombies are MUCH more fast than before, you can't take cover, the ghosts will block your vision and kill you instantly. You can't run around the enemies, the snipers will REALLY QUICKLY mow you down. All of the new elements are fine by themselves, and I enjoy a bit of a challenge, but with everything all at once, it's quite a bit too much.