I found it by doing a search in the editor for aoa_offset and the 2nd hit was it. I changed it from -0.06xxx to -0.15 for starters so I'll see what difference that made next time I fly and go from there. Thanks!
I flew my RV-6A this morning and did 4 clean stalls... The AOA audio tone started at 62 kts each time and continued to get faster until it went solid right before stall at 48.5 kts, so the -0.15 offset definitely made the tone start quite a bit earlier than the -0.06xxx previous offset. I will adjust the offset up a couple tenths to -0.13 to get the tone to start in the mid to upper 50 kt ballpark. Thanks again for the info about the aoa_offset adjustment!