The only homemade paddle I have finished is a Greenland paddle which doesn't flutter much. I have the Werner Ikelos bent shaft and find it to be about the most stable Euro paddle I have used. Most touring paddlers use the paddle with a straight back motion, which will give a bit of flutter to most any paddle. The most stable paddles I have used are the wing paddles, but they are used with a different paddle motion that has the paddle blade close to the boat at the catch and moves it essentially on a diagonal such that it exits the water about 3 feet away from the side of the boat in order to get the foil shape working.

Here is ace Tim Brabants using a wing paddle: https://www.youtube.com/watch?v=BwhdA5wtY2c

I like my Epic Mid Wing paddle so much I now use it for touring and recreation unless I think I am going to be fending off rocks and such. I gave up on making paddles, because a wing would be beyond my fabrication abilities.

You don't need to be an Olympic paddling machine to comfortably use a wing efficiently.