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I'm no expert on the mysteries of AGA screen timings, but couldn't you use one of the 32 bit fetch modes (FMODE=1 or 2) and need only 32 pixels shift? This would give you a 256 pix wide screen, if symmetry is required, quite acceptable for many applications. As sprite fetch mode is independent from bpl fetch, 64 pix wide sprites are still possible. Bandwidth should be equal to OCS 4 bpl lowres.
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