Oh dear. It seems I have offended the sensitive Helmut. If so, I apologise, sir! I apologise if your understanding of aerodynamics is so rudimentary that you can't keep up, and I'll try to be less condescending to your sort in the future.
Let's try this. In a glide, if you wish to decrease your rate of descent, your lift vector *must* become bigger than the combination of your drag and weight vectors, hmm? That is, unless you've cleverly figured out how to magically decrease either your drag or weight. This is not rocket science, old chap. But if you disagree, please explain to the class how a rate of descent can be slowed, or a rate of climb begun *without* excess, surplus.....or MORE lift than your wing was already producing.