I wear 9.5D/E in Strand/Park Avenues. A 9E Dalton would have been the better choice for my foot. I don't think the Dalton is particularly narrow; I think it's a little bit tight on my foot because I went down half a size (something I usually do for all boots). If you're typically a 3E on AE's lasts, you may have wanted to try the Dalton in a wider size. 8.5EEE may have been a better choice. This is just me deducing based on the information you've provided.
See how the 9D fits; if it is too long and too tight, try the 8.5EEE.