I managed to get the top score with Momo in Matsuri Ver on the xbox live rankings with a score of 243,356,550. I also increased my Ikuo PB to 248,109,010, which is just a bit short of my goal of 250+mil.
Both runs had chain breaks, 1 in the Ikuo run (in Stage 5) and 2 in the Momo run. I had a few other costly mistakes in both runs, though more in the Momo one. In the Ikuo run I had a poor stage 1 (ended with 27 million, I've gotten as high as 32.4 million in other runs), so now I can see 260+mil as possible for me with a perfect run. I'm not sure I could score that high with Momo, but I'm pretty sure I will be able to do 250+mil with her at some point. I'll mark that as my new goal, anyway.