I'm wondering if that's the hard limit to how much tanuki's you can gain. I also noticed that on Hard Mode Tanuki, you can sometimes get a 4/4 map instead of the 3/3, which will net you more tanuki drops. I noticed this when I had someone on my Flist in my party (I purposely leave a blank spot so that he goes in) and every time I get the 4/4, but with no one else.