X-700 focusing screen

Hello all

I have a question regarding Mino X-700's focusing screen. I'm interested in split screens specifically. As I have read, there are three screens that offer split focusing. P1 and P2 are horizontal, while Pd is diagonal. Now the issue here:

My buddy has X-700 but he has hard time focusing because his eyesight isn't very good and quite frankly, border lines of the split image are hardly visible even to me (compared to Olympus screen). So I wonder if all three focusing screens are the same in those terms, or maybe some are better than the other?

Also the annotation reads that P2 screen is for lenses with f/2.8 and faster. Does that means half of the split image turns dark with slower lenses like it is with OM system cameras?

I know that manual focus Minolta isn't exactly a modern thing, but any help is appreciated.