Are you close to a Woodcraft?
Bring some pieces into the store and compare them with Walnut, IPE and other woods they sell. Compare the end grain and weight as well as color. Put ID marks on yours with chalk so they won't think you are pulling a fast one. There are some knowledgeable folks there at my local Woodcraft store.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)