ok. here's my meld setup on my armorer when I try making darksteel ingots:

head - i70 cp3 craft4 control39

offhand - none
body - craft4 craft4 control3 control2 craft2
hand - control3 craft2 control2
legs - control3 cp3 control2 craft1
feet - control3 cp3 control2 craft1
waist - control3 cp3 control2 craft1
neck - control3 cp3 cp2 craft1
ears - control3 cp3 cp2 craft1 cp2
wrist - control4 cp4 craft2
ring - control3 cp3 craft2 control1

After careful inspection, I guess you were right that I do miss 1 small meld, which is on my militia wristlet missing 2 CP only. my bad. ^^;

btw, on unrelated note: are you sure you have correct setup on that belt melds? I am using raptorskin merchant's purse as the base, and I think it can't take tier 4 melds since it's below level 50. :?

I will try this again soon with another master book attempt.