Well I did both the Lubegard (red bottle), and I also added 1 package (2 ounces) of the Instant Shudder Fixx. I think that I under-dosed the Instant Shudder Fixx, as my tranny holds 14 qts of ATF. Anyway, I hope that cumutively, I didn't add too many additives that it reduces the torque load capacity. I guess I may find out next week when I tow my 7500 lbs travel trailer up the mountain. If it fails, then I get a new tranny, as I have a 75,000 miles Ford extended warranty. I currently have ~38,000 miles on it.
On a side note, it appears that the additives have helped with the 1-2 shudder. But it still has a "funny" 1-2 shift when the tranny is warmed up (normal daily driving, nothing abusive). I don't know how to describe it though; maybe like the actual shift takes longer. Not that it shifts later, but the actual process of going from 1st to 2nd takes longer when it's warmed up. I don't know... But I guess I'll just deal with it until it fails, IF it fails.