Hello, I'm also having trouble with this mission. So far between deneb 2 and Decima gemina, i've seen 3 lv32 renegade progens and 1 lv39 progen. Not sure where these manes are at...
EDIT: Never found any manes but did find a Centuriata Centurion "near" Lagarto (moon). May have to kill it a few times until the gene-map drops. I got it the 2nd time.