Allan’s point helps in addressing what’s going on. Biomechanically you’re likely pulling with the biceps too much (arm paddling)
Think of the water piling up on the power face of the paddle. If it has no directed escape it will pour off one side till the pressure is released and build again till it needs to our off a side again. Flutter like a spoon type fishing Lure.
Think of the blade as a wing with a leading edge (flowing molecules hits first) and trailing edge. With body rotation to power the paddle rather than pulling the paddle through the water the path of the paddle relative to the boat is at an angle away from the kayak rather than parallel. This makes the blade(wing) fly away from the hull making the top edge of the power face the leading edge throughout the power phase of the stroke giving the water a continuous escape route off the bottom trailing edge. Result should be no flutter, longer period of resistance in which to propel the kayak past and an easier exit point (which can add more speed but I’m already at limit for typing with my thumbs)
Forward Stroke Refinement is a whole lot easier to teach in person than type.
Have fun with your new paddle and your homework is Go Kayakkng!
See you on the water,
The River Connection, Inc.
9 W. Market St.
Hyde Park, NY