PIM-SM and RP configuration

Looking for some input on Multicast PIM-SM and RP config:
SETUP is multiple switches single subnet in a mixed network single VLAN enviroment:
Main Switch is CRS328 4x Multicast senders at ether10-13 with 3x3 receivers on spf 2-4. 3 on each spf connected to 3x HEXpoe (1 each spf).


Setup:
https://sn3301files.storage.live.com/y4mD3WVXgk2N2Aaj25p_8-krqfCom7CSjgHKbmHj_86ghqL6O8WF5vNc-bDp4Ug-uv4BOqZsCvmE9VxGG4c-lp3JkIowrnINAthmGPQPhequkLMylNAG5s2fORXDhhMi1L5IcyqSgk9X_AFbERsojPZ6IS7QKsDzE8_-C2m4o1y01dTdF9lfmZpmjthNaL8iRAr?width=1024&height=726&cropmode=none

The wiki is a bit confusing at this subject so i cant get the configuration correct.