Yes, you definitely need new blades unless this is actually a 6080 pump, the blades are cut at the ends which would be a 6080 or 6060 but also could be due to impact, this will reduce the flow and cause vibration. I went through the factories inventory and they have some 7200.600 drive units left, these were the same as 6100.600 except the shaft, they have the shafts 6080.640 in stock so in theory we can make one and the blades are still in stock. I would either change it all with these parts or change the prop and bearing and upper bearing, the red ring under the upper bearing is not in the picture, I assume you have it? Do the brake shoes stay in and retract properly?