Nah, it's always been 4 for a Perfect. Did you notice that the fever is for onigiri and not the battle item?
I rarely go to that screen since it's extra work (^^;), but we should have still gotten 8 during battle item fever.
Oh, and East is currently leading by ~15k.
I'd also like to point out that the prize map ranges should be 60-300, 300-880, and 880-900 for the 2nd, 3rd, and 4th images respectively. ^^