No IA gear will have Aim because Cunning is the main stat. It gives tech damage, shot damage, and crit i believe. If you saw Aim contributing more it was only to specific shots and may have been level/stat number dependent. If you are continuing to see Aim being better than I'm sure its a miscalculation that will be soon fixed.
On a more game breaker/cynic note, if anyone wants to try that out i'm really curious to see. But then i already played an enh shaman who had to swap from strength for agi one xpac, then used spell power weapons the next...
Btw any ops want to see how strength helps shivs?