Feelers are either a break or capture reward, but you're pretty lucky to get 5 in a hunt.Apparently capturing Gore after breaking horns gives more feelers. Just got 5 after one quest. Or am I just lucky?
Also what's the easiest way to get monster broth in mass quantities?
And as for Monster Broth, the easiest way is to carve high rank Bnahabra which are often flying around places like the Misty Peaks in large quantities. But it's hard to kill them without smashing them to bits. So mix up some Poison Smoke Bombs, wait for the Bnahabra to get close, then poison them and carve them when they die.