Sounds like you're moving and grooving.

Sounds like you're moving and grooving, which is great to hear.

In the third year, you should be settling into a groove.  

Sounds like you're moving and grooving, which is great to hear.

Just make sure your subfloors don’t have any major changes in elevation because, over time, the thin tongue and groove lock strips will snap from flexing.I used an click lock engineered hardwood flooring in a dining and kitchen area for a BRRRR recently since it was much thicker and didn’t flex in the small uneven spots.

Once you're in the groove, a multi would be a great next step.

I am determined to stick with the process, whatever that may be when I find my groove. 

These are old, almost always brick-veneer properties that have a lot of life left in them but have lacked the kind of maintenance they need, especially in recent years.The subflooring in these houses is typically diagonal 1-inch pine plank and they were originally finished with 3/4-inch tongue-in-groove oak strip from end to  end, bedrooms and bathrooms and kitchens alike.

I'm talking about pulling out the plywood and replacing it with 3/4 inch pre-finished tongue and groove hardwood flooring.

Does the speed at which the orbital moves degrade the purpose of this step (pitting and grooving the surface for the paint to adhere to?