The TSB referenced in the other thread will solve the slow fill-up problem.
As for the fluctuating fuel gauge reading, what you describe sounds normal. I'll even venture to guess the reading decreases following a right turn, and increases during a left turn. It has to do with the shape of the fuel tank and the position of the level-sensing float. Nothing to worry about.
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Garrick
2006 Mazda6 Grand Sport wagon, silver, MTX
I'll never forget you: Silver E0, #3895 of 6535, built 10/2/97