I reduced it all the way to 1 with no luck unless I'm changing the wrong thing.
Hm. Weird. I'm not sure why that would be, but I'm not the developer.
If VoxWav is working better for you with your other Androids, I wonder if something is impacting your Tab S2's audio, or perhaps the data transmission from that particular device.
You might want to go into the TcpMic plugin settings, and enable "Save a copy of the wav in the \Wavs folder" (temporarily). You can then issue some commands and then try playing back the saved recordings to hear what they sound like.
But if changing the mic source helped, perhaps that's good enough.
James has a Tab S2 also, and it is working very well for him so far.