Just a thought, based on something I just happened to read recently. Sometimes a smaller needle helps.
An experiment in various needle lengths was done, based on subcutaneous tissue thickness (or where you have the most fat).
Quote:
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The needle length setting was selected based on SCT [subcutaneous tissue thickness] measures as follows: 4 or 6 mm for SCT < 25 mm, 6 or 8 mm for SCT between 25 and 50 mm, and 8 or 10 mm for SCT > 50 mm.
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