Tony, you sure did a lot of experimentation. I do like the interior of the fries cooked at 194 F for 15 mins. It's getting the crispy outside that we need to figure out. I wonder if frying at a lower temp. say starting at 350F drop the fries in and that will extend the frying time and perhaps we would get a thicker crust of fried potato on the outside leaving a creamy inside.
I am going to try another batch where I do a soak out of the cut fries to get rid of some of the starch, add some vinegar, SV, freeze then fry at 350F. In the end I want to be able to SV the cut potatoes and freeze for later use. It would be great to just be able to pull some out of the freezer and fry for dinner. That's my goal.
BTW, I have bought some extra butter to make ghee;)