Oh ladies these are all fabulous ideas.
JD: yes this is true, we do consume ours quicker. Good point. (sorry I neglected to say in the last post we make "6"L minimum per week, wheres my mum would only make 2-3 I'm thinking). The whey forms straight away for her, ie once spooned carefully into the fridge container out of the thermoserver.
DB: oh yes also a good point. I'm exceptionally careful with the starter piece, it's always a fresh sample (but I'm the only one serving it out in our family and I'm a tad OCD with clean spoons and double dipping etc etc. I had never thought of that point, so thank you. I need to check what my Mum does in that department)
My yoghurt is still setting very well after 9 month of using the same starter, and its creamier than when I first began, so I'm not too sure that I have bad bacteria overwhelming the good ones??
I posed the same question over on a Facebook forum, and Leonie from ThermoFun indicated to me it would be age of the culture, and as long as I can ensure a clean non contaminated starter is used, my Mums batch just has a few months worth of catching up to do on mine. Check out her link at
http://docs.com/VT3P (bottom of second page speaks to it)
Now what I plan to do is 2 things: buy a fresh batch of pot set yoghurt and make it myself to see if I get whey. And have my Mum use my 9 month old starter and see if she gets less whey. Keeping everything else as constant as possible of course. I love experiments - will keep you posted as to the outcome/
Thanks again for helping us "whey" through our journey!!
CD