I don't know how slippery your aircraft is, but descending with the glide and decelerating is almost impossible, which is why when given the choice, I prefer to intercept from a lower altitude at a lower speed. I'll 'dive' at 250 to get there and it give myself between four to five miles (to slow up from 250 to Green Dot). But ATC normally interfere, so you end up flying en-economically (from a personal point of view) and complying with their requests.