Howdy there (not sure if you'll ever read this,) one of the folks trying to S rank snick's challenge. Been going at it for hours and I just dont think its possible to do 8700 in under 5mins.
It's mainly bloodsauce dungeons level design (mainly area 4 and 6) that goes against the timer and score. There's the shotgun as workaround for it but you're lucky if you can get 4 pizza coins in one lucky go.
I've yet to see someone do an S rank for snick's challenge in this mod but if anyone else has done then I salute them.