How to adjust microphone volume on SPH10?

I just got a new SPH10 to use with the Bluetooth Audio Pack on my goPros.  The microphone is very quiet on the recordings.

I believe this is on the SPH10-10's end as when I use it as a simple bluetooth headset to talk on the phone (iPhone 6) I have to talk very loudly for the other party to hear me well.  If I talk at normal voice the other party on the call always says I'm too quiet and asks me to speak up.

Is there a way to up the gain on the microphone on the SPH10 to get past this issue?

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