You won't lose the barding if you pepper him. You can unlock the other two sets by leveling im past 10, yes. I got WHM first and DRG armor around rank 16 or so. Should have the last barding set when he hits 20 this week or next.
Awesome! Ok, gonna pepper and balance him out. Got a batch of onions and a whooole lot of krakka in the garden. I thought hitting rank 10 I would lose some of my fervor for leveling the guy up but now I just wanna level him up even more.