Heh, well at some point the fish will start appearing too late, and you won't be able to see quickly enough where they are coming from next, and then the combo ends. Anyway, I have pretty much mastered my own way of doing the combo with the circular arena, and I managed it twice now. It's lower than with MandM's method, though. I got a combo of around 9000 and he got 10000, but I always did it like that, so I don't think I'll really be improving it, certainly not now that I found a nice method to do it.
Edit: I got about 85400 after part 2 of SBTC... I continued, but it's not enough points. Oh dear me, but I've played part 2 pretty much perfectly... I only missed 100 points at the combo continuing glitch at combo 2. I got a combo of 9210 at the first combo. I got the third one right. Without the gems, but still... maybe I should include two more gems in that combo, or do it the old way (four gems in corridor, Hoodblaster, snowman, Hoodboom, then jump down and kill Hoodmonger and get matuvu? Maybe that gives even more points, but I don't understand how I could possibly have missed 2000 points on that combo solely. I lost 1000 on the second scaffolding combo, because I missed the Hoodblaster after the first gem, but that's only about 1000 points. Oh, and funnily enough I missed the Spinneroo in combo too at the beginning, because I was too close to him when I shot him and he started spinning around. But that's only 400 points, so what the hell. I lost 1500 points in total. Could I have lost 1500 points on the third combo? Or should I have done the circular arena combo differently, like getting all the gems first there? This is annoying... I will play part 3 a few times just for the hell of it, but I should replay the level again, because I don't feel like doing the snowboarding trick to get 3000 points everytime I play the damn thing. I mean, the launching glitch in this part works only like once a year, and getting the green gem once a month maybe. So bleh. I will just try to get over 20k in the first part next time then, and play some of the combos in part 2 differently again, because this is really annoying.