I agree Andre,
Your temperature and humidity seem to be spot on yet the salami had lost the desired weight after only a few weeks which would indicate to me that the airflow must be too fast. Although I still have a lot to learn about making salami, one thing that I notice is the difference in flavour between a two month old salami and one that is three months. It seems to me that after a couple of months the flavour begins to change in a very positive way. I don't know if anyone else has found this?
From what I can glean from books is that during this time certain bacteria work their "magic" while the mould on the surface breaks down more of the lactic acid leading to a higher pH and a milder, less acidic taste. Maybe someone who knows a bit more than I do could expand on this?
In short, I find there are big advantages to allowing the salami to dry and mature slowly.
Looks great though, I'm a fan of coursely ground meat and fat too.
Best of luck
Ryan