Hi Frank.
I appreciate your kind words about the field test article.
I tried to do the best I could before the cold weather took over...so I'm glad you feel it turned out well.
I haven't received the magazine yet...just like last time...I was probably the last person to receive it in the mail.
As for settings...no secret...and not really any changes from what I. always run.
That is the key for me to be able to tell what coil works for me at different sites...and more importantly WHY.
If I made a bunch of settings changes each time I put on a coil...I wouldn't know whether to attribute the success...or failure if the case may be...to the coil...or the settings changes.
I have a rock solid combination of settings I use for all sites and all coils...no matter what the conditions at each site are.
This has worked very well for me and has allowed me to train my ears for a particular sound to listen for.
For example...a lot of people feel you should use fast ON when hunting in trash...and they may be right...the manual even says so.
Me however...I feel fast ON clips the signal short...and I don't like that.
I leave both fast and deep OFF..and always have since I found the group of settings that started producing more seated coins for me...and even 2 bust coins.
The key for success to finding coins in the iron is training your ears to listen for a particular souned which is ever so slightly different from iron falsing.
It doesn't always work...trust me

...but it has definitely improved my success in iron.
The ONLY setting I ever change when hunting in iron is the sensitivity. Sometimes I will switch to semi auto 26 instead of manual..if it becomes too hard to tell falsing from coin chirps.
If the coil "handles" iron well...then I'll run manual..but if I need to...I'll run old faithful semi auto 26.
Sure there are a lot of settings to tinker with and they might actually improve what some people find at different sites.
Me personally though....NOT making changes is what has helped me drill the "sweet" sound in my head.
Each little setting change can effect what I hear...and I don't like that.
I truthfully feel the secret to success in iron is NOT what settings a person uses...but more importanty what they have trained their ears to listen for...and how the coil they choose performs over the iron. The X-12 just simply performed for me. Not sure it''s anything I did... but AM sure it's just simply an excellent coil for me.
That's as honest as I can be.