Getting Diversity/ESC to cancel noise

I'm using a 6m dipole to pick up noise from a neighbor 300 yards away, then trying to use Diversity/ESC to cancel out the noise from my main antenna, a 5 el LFA yagi on 6m.  At 180 deg phase offset, I'm not hearing any null in the noise.  I have tried this at multiple gain settings, and also at all phase angles.  RF preamp gain is individually optimized for the two antennas to get 8-10 dB increase in noise when the antennas are connected vs disconnected, per the Flex article. Yagi is on ANT1 and the dipole on ANT2.  Noise level on ANT1/yagi is reading -112 dBm at 3 kHz bandwidth.  Noise level on ANT2/dipole is reading -108 dBm at 3 kHz bandwidth (for FT8 and MSK144 work).  Any tips on how to get this working?  Thanks in advance for comments or help! 73, Keith - KE4TH