Pushing the development increases contrast. If you already have quite a gap between the performers and the background, pushing will make it worse. Similarly, one performer dressed in black, the other in white needs normal development or less. The spotmeter reading on the clothing shows only 2 stops difference, which seems suspiciously low.(posted 9270 days ago)On the blur, is this camera shake or performer movement? For camera movement, can you get closer with a shorter focal length lens?
If these are not public performances (rehearsals or whatever), you might get the performers to keep still for you, and you can get the lighting turned up at the same time. Difficult for dancers. Are we taking dance here, or music, or what?
Off-camera flash may be a possibility, even if this is just held at arms-length.
You might try XP2. I don't know that film.
When I do this type of shoot, I accept that many shots will be unusable because of performer blur or inadequate DoF. Anticipating movement, and lack of movement, is an important skill here, you you can expose just when the performer is momentarily stationary.
Hmm. You (or your editor) want greater DoF, less blur, less grain. You need shadow detail, so pushing is a bad idea. We are running out of options. You need more light.