>> I set my mower to the top height adjustment most times when first starting, then work down to a lower level.
Me, too. When the pile of twigs is high, I often tilt the front wheels up and then push forward about one mower-base-length, then ease the mower down onto the twigs. Then rock up and down a little.
Lift up again, move forward, and take another bite.
Do you have a special mower blade, or do you re-sharpen it often?