I note that you are a professional so will take the time to post two techniques neither of which require misting. First, have you tried heel cuttings? Or the standard 'from seed' method?

The first rooting method I call the 'toothpick technique' which allows a cutting to callus on the plant before it is removed. For this you will need a small, thin, very sharp pen knife (or exacto knife) and a small block of wood. Locate last year's growth on a stem, place the block of wood behind that section and make one single vertical cut through the stem below a bud. This is done in August/late summer. Insert a toothpick through the cut, tie some sort of marking tape on the stem so you can find it later and walk away from it until October. At that time remove the cutting severing below the toothpick, trim the toothpick to the stem, dust with rooting hormone and stick in a cold frame. Or, cuttings can be placed in a greenhouse where they will root without misting. This is my favorite hardwood/shrub rooting method for all that type of plant especially difficult to root ones.

The second method is a variation of the first. It takes a little practice and azaleas are a good practice plant. One simply makes a downward snap below a bud on last year's growth in August partially severing the stem. Leave it to hang on the plant until October, then remove, dust with rooting hormone and set in cold frame or greenhouse. When I am working with a difficult to root plant I will also use this method, snapping the stem at a main branch creating a heel cutting.

Once you have worked with these methods you will find them easy and can expect a high level of strikes.