Very Rich light Throttle Cruise AFR readings

Hey guys,

I have recently installed a Holley HP 750 carb that has been professionally converted to blow through. Recently installed a P-1SC Procharger on my 5.9 Magnum build. Also, installed a water/injection kit to keep the air charge cool.

I have a AEM wideband AFR guage. My readings are perfect at idle and wide open throttle. Also good at half or 3/4 throttle. The only problem is a very rich condition at light throttle cruise. Reading in the 9.5:1 range. The first few drives out with the new set up it didn't do this. I was too rich at WOT so the only change I've made is jetting down the secondary's. After that I all of the sudden had this rich condition at cruise, which obviously doesn't make sense. Fuel pressure is good, float bowl levels are good. Just can't figure this out.

Any help would be greatly appreciated. Thanks FABO.