A 2.8C for US$200?? That's a steal in pretty much any condition. Certainly it deserves a CLA---you may get pretty good results from that trial roll, but with a lens that good it would be a shame not to get it worked over to its full potential. And you certainly have plenty of headroom left between the price you paid and the price you might have expected to pay!
The dials do take some getting used to. I'm always turning them the wrong way.