the quad states up to 140 (the cuboid dousn't let it go that far) but one of the guys in my fav store uses it constantly at 130 (probs 50/50 juice) shouldnt be a problemThat could be your problem right there; ("90Watts") The Coil might not be able to handle that amount of power without burnt hitsTry dialing it back to about 75 or 65
people new to the tfv4 generally underestimate how much juice they are using, +1 fo the try less nic ;p