I’ve never gotten Zim to print supports correctly. I get a loose, squiggly mess that sticks to nothing but the nozzle and heater. And I’ve never gotten rafts to work at all.
I have it set to pillars, 2.5mm pattern spacing, 45˚ pattern angle, 3 interface layers, 0mm interface pattern spacing.
For rafts, I just have it set to 2 raft layers.