Circuit guidance to output -14V from 12V supply
This is not exactly your question, but I would suggest replacing that stuff with an inverting regulator like the ubiquitous MC34063. In my experience stacking stuff up with unconventional (perhaps reversed) loads and so on can lead to all sorts of problems. 



The output voltage is regulated and can be set by R1/R2. 

You can change the values somewhat and have the converter operate directly from the +12V in. There is a calculator here, I can't vouch for its accuracy- I would probably work through the datasheet procedure at least as a check.