No problems at all in flight with 3 ZYX's and a crossflashed CX-3X1000.
I just had some really fun flights with my 250 DFC head and the ZYX. It's flying so sweet. Can't wait to fit the 250MX motor, when it arrives.
Attached is my 250 DFC ZYX setup file, as promised:
Blades: HK GF/CF tapered
Pitch: +/-12.5 degrees
Tail: MKS DS95i
Tail blades: Align 40mm