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Assuming the 294MM behaves the same way as the 294MC, don't use bias frames. They don't behave as expected.
With my 294MC, I used lights and darks at matching temp, exposure, gain and offset, then for flats I used a dim light panel to get ten second exposure times for a good flat frame, and ten second dark-flats at matching temperature, gain and offset.
If you do not apply a master dark as well as the master flat, the dark current (Which is relatively even) will be accentuated in the corners where vignetting is being corrected by the master flat. Every time I use a flat/master flat on a light frame without a master dark I get something similar to what you posted in the first post.
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