I'd start with
hA1=axes;
instead of label, but guess it really doesn't make much difference other than I don't like the implicit creation just as a matter of style.
I didn't have any trouble with missing areas altho I did have to add
set(haxes2,'ytick',logspace(-4,4,5))
to get the labels to show on the RH axes. I'd also only use gca to retrieve the handle of the desired axes the first time and then still only if you insist in the implicit creation; otherwise always use the explicit handle in any set/get call or in [x|y]lim, etc.,to ensure you're addressing the axes desired. It's quite easy to insert some other line or make some other interaction and all of a sudden switch focus from where it's intended and gca will always return the present irregardless.
