Welcome Stefan. You were using extremely stiff fins. What´s your weight?
Thanks for the warm welcome, guys!
I walk at an average of 240 for 6' tall - definitely overweight... I tried plenty of fins but at over $400 a pop it is getting expensive to keep trying. I had high hopes for the C4 40, but I find them soft as wet noodles. The trick with the #5 is not to even think about overpowering them or bending them at 90 degrees - it will not happen. But put the right pressure on them and they will take you through the nastiest stuff you can imagine - including swimming big fish up when the reel jams.