George,
You may have damaged the interior wall of the hose. I would suggest using the proper mandrel for installation of the 491 fittings. They prevent the leading edge of the fitting from digging into the rubber of the inner wall.
This may also be of interest. EAA has a large collection of how-to videos including this one showing how to fabricate 303 hoses.
http://www.eaavideo.org/video.aspx?v=4470821001
Chris Zavatson
N91CZ
360std
www.N91CZ.com