I think I have finally achieved

I followed the 2nd recipe on davidg618's post "Adjusting Sourdough Starter" which allows a pure sourdough baked bread to be finished within 6 hours.  This is the first time that I could bake a sourdough bread with some height.  All my past ones were flat because they spreaded sideways once they were released from the form they were final-proofing in.  Also, the colour of the crumb is no longer greyish. 

Here is how it looks like

A big 'thank you' to davidg618.

Enid