Appreciate the advice! Now it makes sense as to why my oil level is too high, explains stumble and rough idle as well.
After reviewing various threads and instructions on rebuilding Fuel Distributor I have decided to go with a reman FD from CIS Flowtech out of Alabama. Likely won't arrive for a couple of weeks so in the meantime I'll look into changing out injector O-rings etc.
Don't be scared of changing that control piston seal. It's not that big of a deal and is nothing like doing a rebuild. Of course, if you have the resources, it's great to start with a fresh fuel distributor. Just saying, don't be put off by getting into it a little.