Fireflybob,
You say
"IMHO, increasing speed below 10,000 ft has little effect to regain profile if you are high. Increasing speed at "high levels" will bring you back on the profile because the TAS is higher and an increase in speed results in a lot more drag. (I seem to remember that if you want a steeper angle of descent then you need a lower Lift/Drag ratio!)."
Think about TAS/EAS and limiting mach numbers. At higher levels EAS/mach is definitely limiting. Think of it all as number of molecules of air passing over your surfaces per unit time. Higher speeds at lower levels increases drag significantly more than at higher levels. Otherwise we would all cruise round at high speed/low level to save fuel (since ,in the cruise, thrust only has to overcome drag). Now there's an idea