Just my thoughts....
The lack of the bulk charge voltage (14.4v) seems troubling as it seems that your test(s) should have triggered it.
As for the float voltage, it may just be hiding from you
The manual says the float voltage should not kick in until around 48 hours of not sensing a load change. -- not sure if you waited that long?.. Another reason, it may be hard to detect as it might possibly be masked by the surface charge that has built up on the battery during absorption mode (13.6v).
If it ever warms up a little around here i plan on testing ours also.
Will be interested in your findings if you are doing further testing.
Tim