TomK,
It sounds to me like you are doing pretty well. The physical activity, running, is definatly going to benefit you all around.
At night when we sleep salivary flow goes down in everyone. People who have had OC treatment experience the same drop in salivary gland flow but we have to remember that most of these individuals have impaired salivary glands to begin with. That is why dentists suggest fluoride treatments at bedtime and on occasion overnight wear of fluoride trays. The main reason for this is to allow the fluoride to protect the teeth when saliva flow is at its least.
Wearing fluoride trays when you sleep will also mechanically stimulate salivary flow even in impaired saliva glands. When something is in your mouth whether you chew it or not the brain sends signals to the saliva glands to produce more saliva because it wants to aid in digesting it. People who wear bite guards, snoring appliances, orthodontic appliances and fluoride trays to bed will tell you they tend to drool when they sleep.
I'm not sure what the solution is for you but you may want to try fluoride trays, or having a bottle of water at your bedside.
I hope this is somewhat useful to you.
Cheers,
Mike