I used the topcoat for a while, but I was still getting a bit of rust, so I switched to wax. Plus it's kinda spendy.
Keith, .001 below the table is just the reading on the gauge, and within the margin of error. Important thing is, I was no longer feeling the board catch on the edge of the outfeed table.
Update: I just surface jointed about 12bf more of the soft maple, and the tables are getting "draggy" again. Even edge jointing against the fence is difficult. I tried some hard maple & some walnut with the same result. All the woods dry, and been on the rack for at least a year. It's gotta be the wax.