Do you try to use the least amount of brush strokes possible when you blend? I try to use the biggest brush possible with the least amount of brushstrokes when I blend because when I use smaller sized brushes, I get this weird lumpy gradient that doesn't go well with the painting.
Usually on bigger pieces I use the least amount of strokes possible only near the beginning (when I’m trying to lay out shapes, colors, and values). After the first hour or two, I stop worrying about stroke economy and kinda blend as much as humanly possible. Like, to blend in Photoshop, I use the eyedropper tool (aka the color picker), which is bound to the ‘alt/option’ key on my computer. When I’m blending after the beginning stage, I tap that key multiple times a second, essentially throwing brushstroke efficiency out the window. I’d only pause if I needed to draw something not blending related like strands of hair or highlights or little stars.
Example of a pic in which I’m trying to use a smaller amount of strokes below.