Pics as requested showing a few of the more visible/prominent uneven absorption problem spots.

Most of these occurred after coat 3 of basecoat/stain and were a consequence of either pooling or missed unblended overlaps when I moved from working outdoors to indoors to avoid overly bright light. Coat 3 seemed to take forever to dry (due to cool ambient temperature at the time ???) which might have contributed to the uneven absorption and pooling. Another contributing factor to some blotches might have been smearing from inadvertent contact with my gloves or the work bench when I flipped the body over to do the bottom side (I have since made a jig to hold the body clear of everything).

Paler stripe left of pic centre is actually from glue residue and most of this will be hidden by the scratch guard, but the central blotches won't be hidden.
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Side pic shows a missed overlap.

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More blotches towards tail.

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In looking back over pics from previous coats some of my problems might relate to inconsistent application of filler - I put more onto end-grain and cross-grain areas than elsewhere.

Do I need to sand back to bare timber and start again or could a 4th coat help in some way ?
(I previously tried some selective spot sanding on blotches and overlaps but this was not precise enough and just seemed to tear off the whole finish).