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3m bifold doors though right over the offending region. If I don't level it out I fear I'll get jammed up doors later.
I'm pretty settled on packing it up too desired height now. Either a bespoke length packer under each stud, or a long firring strip like wedge. Leaning towards option 2, but need to have a go at making one first. I'm glad for track saws for occasions such as this.
Overthinking it. Its a shed. Add timber and packers. Job done.