Sounds like your not getting a good yield from your grain. Next time try stopping your runoff before your grain hits air, and stir the mash. Let it sit a few minutes before starting your runoff again. If your desperate do a stir(and rest) everytime you throw a can of sparge water on it. If you...
Use a thief to snag a sample out, run the outside of the thief under cold water to get it down closer to 20 degrees C. Plop your hydro in and dump that sample back the pot! All gonna get boiled anyhow