You definitely have something wrong with the ejection system. It should not freewheel, and should return to position without blocking the chambers.
Although it doesn't specifically cover these very early DA Colt's, your best bet is to buy a copy of:
"The Colt Double Action Revolvers: A Shop Manual, Vol. One" By Jerry Kuhnhausen.
This is a gunsmith's book on most Colt revolvers covering just about EVERYTHING known.
It shows and describes full disassembly, inspection of parts, reassembly, trouble shooting, actual repair of damaged/worn parts, and how to do the all-critical timing of Colt revolvers.
Cost is about $30.00 from Brownell's, Midway, and most book sellers.
This book was written as a training aid for trainee gunsmiths, and I consider it to be necessary equipment for all Colt DA revolver owners.
By using the book you should be able to diagnose the problems.
Parts for these old guns are rare, especially in unused condition but can be found at:
Gun Parts Corporation:
http://www.e-gunparts.com
Jack First Gun Parts:
http://www.jackfirstgun.com
Poppert's:
http://www.poppertsgunparts.com/index.htm
I don't know of any pistolsmith's who are qualified to work on these early Colt's, but you might ask:
Pittsburgh Handgun Headquarters
1330 Center Ave.
Pittsburgh, PA 15229
(412) 766-6100
They are VERY qualified Colt 'smiths, but I don't know if they work on these very early guns.