Improving items in a rhythm counting to three gave me 2 MAXED out items.
Please try it to make sure I'm not insane.
It's beast.
Didn't experiment until I was already maxed level in blacksmithing, so it may not work till you reach the end.
It's all about the combinations some DNA strands neg others and some increase it. You might just be wasting space with a ( str- agi+) and a (str+ agi-)
 "Battle without End"){kind=icon}
 "my first game"){kind=icon}
 "Phage Wars 2"){kind=icon}
 "Doodle Devil"){kind=icon}
thanks