Northern Flyer,
Your second post is right on. From publication FAA-P-8740-49, p. 2: Calibrated airspeed should be used to calculate the proper approach speed at any landing weight and then converted to IAS for practical use. You should do this because, for some airplanes, the indicated airspeed near the stall has significant error.
How to do this: convert your IAS stall speed into CAS, multiply by 1.3 and convert that number from CAS into IAS. But it sounds like you figured all this out on your own. Very erudite.
This publication was written by William Kershner, a prodigious writer of aviation books in the U.S.