What about slowing below best glide, but (obviously {8^) above stall?

No reason why that wouldn't work either. A friend of mine uses this
technique in his Citabria from time to time. I don't like to do this in my
airplane, though, because roll control becomes very heavy and slow (due to
yaw stability) at low airspeeds.

If, on the other hand, you're having to hold too low of an airspeed to
keep the landing point from moving up, you don't have enough energy to
make it there and you're going to come up short.

This I don't follow. If the spot is steady, you're going to make the spot
at your current speed (assuming you're holding that speed, of course).

Right. But, as I said (look again at the paragraph above), if the spot is
moving up and you don't have the energy to keep it from doing so, you're
going to come up short.

LS
AC fun racer 503.

- Andrew