Just got my Scoutmaster, need setup suggestions...

I have a Superscoutmaster with a VPI arm which is very close to what you have. I know the reviewers have said how easy this turntable is to set up, but mine took weeks to get it perfect. You are looking for perfection. Don't give up, there is great sound hidden in your records, and with careful setup, you will be plaesed. This non-centering issue probably comes from the fact that your tonearm is not square to the record. Put a record on the table. Take a straw or coffee stirrer (VPI gave me a long aluminum rod that is embedded in a piece of cardboard - I don't know if you just didn't see it and tossed the cardboard with the rod). Anyway - lay the coffee stirrer, rod, or straw, on the tonearm headshell right in back of the screw slots. Let the tonearm down on to the record. Looking from the front, eyeball if you can, or (what I did), measure the distance between tha ends of the rod, coffee stirrer, etc, to the record. Take your time and be careful. Make sure the rod is in that groove in the headshell's top, and measure very close to the rod on both sides. Check again that the rod hasn't moved and twisted out of that groove in the headshell. Measure very close to the rod to avoid parrelax errors being careful not to touch the coffee stirrer. I'll bet one side is higher than the other. The object here is making the 2 measurements from the coffee stirrer to the record, absolutely equal. The adjustment for this is the weight in the back. The weight hangs down from the arm tube itself. If you loosten the allen screw rotate the weight, and firm up the set screw, gravity will force the weight down which will equalize the distance bewteen the ends of the coffee stirrer, etc. at the headshell. Yes, I know, that will ruin the careful vertical tracking force adjustment. You will have to break out the Sure guage, and reset the tracking force. Yup, the coffe stirrer ends are not equal to the record again. BE PATIENT. You will go back and forth a number of times, but eventually, you will find that exact adjustment. When you get tired, go get a cup of coffee, and come back later. There's no hurry. It takes lots of time.

Make sure the imbalance is not due to downstream components.

One thing you can do to make it easier to sent the weight and arizmuth is get a 1/2" o-ring and slide it onto the back of the arm. With the ring on and pushed up against the counter weight adjust the weight to the desired grammage.
Now when you lossen the set screw to ajust for the arizmuth the counter weight will not move back. Adjust the weight left or right and keep it pressed up to the o-ring. tighten it up and the weight should not have changed that much.