I'm not sure why I am just now seeing this but if you haven't attacked the issue yet, here's an EZ fix.
I recently removed the outside shower box (for a different project) and reviewed the under-tub area. I remembered that our tub had a soft spot where yours is. I noticed that there was a gap between the tub bottom and the floor. I got a can of that expanding foam and filled that area. I left it set for a few days, then I trimmed the excess foam so that I could get the outside box back in. I tested the tub and it's solid as a rock.
Hope that helps.
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TrailManor Elkmont
640W solar- 230AH LiFeP04 Battery
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