Yea I use a 35lb anchor, and to help with the swaying I usually play with the oar blades( ie one flat one digging) which helps in min flows. I did have a problem anchoring in the S Turns on the Sop when I had the port side oar flat, on top of the water, and the starbird digging. Well It is swirly water and after 4 or 5 minutes my port side oar(flat blade, skimin the surface) got some down pressure, I have no idea how but the blade got sucked straight down. When I noticed and went to fix my oar shot right out of the boat, I couldnt believe it, it bent the stock willie oar locks like nothin I ever seen.

Long story short, I had a extra oar, tried to keep my guys fishin , made calls to guys I knew down river and a mile or so down I ran into a super nice guy with two young kids loading my floating oar. I guess it floated down into their anchor rope.
So ever since then i am way cautious when ancoring.