[reeses]

Those vocal exercises singers do seem silly until you run into a problem such as this. They've been working on getting more mileage out of their larynxes for hundreds of years and have some pragmatic practices that can help.

Lots of water, avoiding nastiness in the air, learning the bare minimum volume of air you can push through your throat and still get results, and taking breaks when your body (either by feel or sound) tells you that it's tired.

In this specific case, adding leverage with short macros such as "laip" and "slap" is essential. There's no way you could work a full day spelling everything that wasn't in the recognizer's dictionary.