When I am doing my blends I thin each blend pass the final pass will be very thin more reducer then color. With Dupont I thin with 150 (binder that's in the mix contains no color) and basemaker (reducer) 1st pass will have 50% more added to the original mix the next pass will have 25% more and if needed the final pass will have 25% more making the mix extremely transparent helping with the fade and also a little flick of the wrist on each blend pass helps.
Those lighter colors can be a real pain to blend I've had colors that you couldn't blend on itself, like putting a spritz of color on a spot to cover something, you have to coat the whole panel over cause it shows.
I would look into a base blender from your vender they should have something for ya just using extra reducer might not work well because you loose the body if that makes sense.