I have the intensity at max. The flanger is strong without the kill dry. I use the same settings with just the intensity increased when using with Kill Dry. Parallel Dry is mixed at the same amount with the effect. Still not strong as the non kill-dry mode. Since I am mixing the dry signal equally, it should sound the same. I also played around with the phase adjustment of my parallel mixer but does not chnage anything.
Or, adjust the mix/intensity knob.
A flanger effect mixes a delayed signal with the dry to get the effect, so it needs some dry.
Adjust the mix/intensity setting to control the wet/dry mix.