The texture of the lomo should be like a soft Salami. I guess drying in the fridge won't work, as temperature is too low. As I said, humidity can be easily obtained by wet towels. When using ash you don't need to controll temperature and humidity, the meat will dry slowly as the ash takes over the moisture of the meat. Good results you get with a duckbreast, should be done including curing within 4 weeks. Just salt it, wrap it in clingfilm for 2 days, take it out, wash and dry, dust with white pepper and bury it for 3 weeks. Take out, brush away the ash and enjoy.