I've upgraded to an E3DV6 extruder and installed the included thermistor. I'm attempting to do a PID auto tune because I keep getting the temp fall error. I upgraded to a 40 watt heater before the E3d, and haven't had any issues until I used the included thermistor. I run dual fans so I've been keeping the fan speed at no higher than 80% with no issue. Now, even down to 25% I'm getting the error. I'm using S3D and I can't get the fans to stay on during the auto tune. Any other programs that will allow it?