I think I know what is happening.
The mod you did to your impeller was the one where you superglue the impeller to the shaft so it does'nt have 180 degrees of movement. If so, thats the reason.
You see the reason that play is allowed on the impeller, is due to the low amount of torque the magdrive has. So the shaft/motor is allowed to speed up a bit before it meets the resistance of the ipeller/water.
Now that you have glued it together you have negated some engineers brilliant solution to a design problem.
Buy a replacement impeller/shaft and ur problem should go away.
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Water Cooled Inwin Q500 (Dual Rads: Rad1 = DTEK Pro Core | Rad2 = Blick Ice Estreme, Hydor L30, Dangerden Maze2, Bay Res Typhoon Reservoir, 1/2 " DD Tygon Thick Wall Hose).
Flow: Res, Pump, CPU watervlock, Y into both rads, both rads into res independently.
Athlon XP 1800+ (@ 1731 - 150mhz fsb.), on a Asus A7N266-c, and a Radeon 9000 *waiting for RMA'd Saphire 9800 ultra from Newegg)
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