Hi Pete, nice piece of apple, stunning feature/grain, I'd wonder if the abrupt change in the curve throws the form.
And could be as you've said, the base is over thick, it could do with reducing, an maybe a small detail, cove/bead the top corners, lower as well ... then we can at times envisage past forms we've seen or done before, then that's part of development and the whole piece has potential to evolve.
The shorter bamboo works and to have them together, lower picture.
Funny.. the more I look, the more it grows on one as a piece ..
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Now.. if you'd said Pecan and Maple ..
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Cheers David