Why would you use fracture but not demolish?
Fracture is 220 potency over 18 seconds for 80 TP vs Demolish which is 240 potency over 18 seconds for 50 TP, Not sure about your monk but i generally don't get Paeon so its very easy to TP starve yourself on fights in Coil, especially turns 4+5 and its the main reason i personally don't use fracture or impulse (not to mention Keen flurry and bloodbath are good defensive cooldowns for survival).