Oh, gosh, those stinkers! One thing you *could* try is flash searing it - heat a bit of oil in a pan over med-high heat - and heat each side of meat - just 15 seconds or so each side. SOMETIMES this helps. Also, get some shredded cheese and mix it up a bit in the meat - making sure some cheese is on top for smell. Drizzle some broth over it. (just don't micro it)
The ingredients look good. I use NV and Wylie will eat ANYTHING. Marcel would only eat lamb. Then I tried beef, and he did like that a bit. Recently, I just added organic chicken (not regular) and they are FANATIC over it - it's like butter. So, NV may have something in taste.
So, I don't know - you could try to entice them using a few methods (others will probably have some tips too) before trying NV.