Refer to the Loading Screen Tips :
Crafting the same item may yields better result.

So i advertise everywhere to ask people using my craft service.

1 specific item each day.

The queue must be same item.
example : today i offer free craft for +6 gloves,
so 5-6 ppl come craft, total crafted about 20 gloves, then i continue craft my own.

My Advice :
Entering July, No matter how much you craft in 1 queue, result doesnt seem better. Too many crafter like me use Blacksmith earn alot money from RMAH. blizzard seem ninja nerf Blacksmith.

My last try : +6 glove ( 3rd Jul )
50pcs +6 glove ~ total cost around - 8m (mats + crafting fees)
Best Glove i get :

155 Dex
108 Vit
48 Cold Rest
70 All Rest
+health Glove 3K+
Pick Up +6
Sold for AUD7.90
Others mostly crap, not even 1 got crit dmg+crit chance.
Some sell for 200k-400k, USD3.50,AUD2.80...

Since then i quit crafting.

I strongly believe Blacksmith Today strongly depend on luck.