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Hi Logan,
I also had to initially fine-tune settings to get reliable autofocus with SGP and narrowband filters. What works for my 3nm and CCD with small pixels is binning 2x2 for autofocus and 30-second images, plus min star size is at 4. Step size for the motor should stay the same as you had with LRGB filters.
These settings work reliably for me for both bright nebulae and also for star fields without any nebulosity.
Focusing with Lum and applying offsets would be faster though due to shorter exposures for a Lum as opposed to narrowband.
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