Sorry I have not been following along recently. Need more information. Did you level up "only" on the 1st shot?
Can you tell us please what camera and lens you are using? How many "on horizon" images are you taking? You say the above sample nadir picture was stitched using Panoweaver. Which version of Panoweaver are you using?
I agree the above tripod cap nadir is well formed. At the moment not sure what is causing the wood floor splice issue.
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EasyPano - Panoweaver