Is anyone using an Antlion ModMic 4.0 with your Flex? Specifically a 6600? I know every voice is different, but if you are using this mic and would care to share your settings from your microphone profile, it could help me settle on the settings I will want to use.
It does not matter what mic you use, or whose voice is used with it, as long as you know how to monitor/hear/record YOUR audio, so you can adjust it how it sounds good to you. Even if someone else had answered that they have that same mic, their voice settings would likely be wrong or "blah" for your specific voice.
Ken, one of the Elmers here, put together this great post below. Since you have a model 6600 (has full duplex), you can use the same info;
There is a link to his more recent video in the middle of the thread. Since each person has a unique blend/balance of high and low frequency speech patterns, this procedure will permit anyone to adjust any mic.
I can't recall if the thread mentions it, but you can all use a free Windows Audio Editing program called Audacity to select the DAX audio channel from the Flex, and record your voice while transmitting, perhaps 1 watt into a tiny dummy load. Then you can play it back, and decide what else to adjust.
I hope you find the info helpful, and Ken is great at answering additional questions.