Gary I have a similar condition on one hand, I have tried many treatments, ointments and lotions....
I finally found a doctor that told me just plain petroleum jelly and I use a nitrile medical type glove over it so it stays moist all the time. Of course to hide the "rubber gloves" I wear gardening gloves, winter gloves, dollar store gloves.
I have done this for a couple of years and am at the point where I can go for hours without the gloves when in public but I even sleep with the vasoline and gloves on.
If I forget or get lazy my skin starts to get crusty then cracks and is very painful. Of course I try not to let that happen now.
I keep dollar store petroleum jelly and nitrile gloves I buy at harbor freight all over the house and in the car and at the gym.

I'm not trying to give you medical advice or compare my condition to yours, just to let you know I appreciate your story because I've been there.