ok i've found a way to get the lashes to last for at least a week and a half now, per application, even with my oily lashes!
what i do is i put the lashes on like normal, and once it's dried i pour out a drop of new glue, pull my lid up so i can see the bottom of my lashes, and with the tweezer dipped in the glue, i 're-enforce' (add more glue to) each cluster, only the bottoms. and by doing it at the bottom of the lash the oily lid doesn't bother it and it the glue isn't as visible than if it were at the top. i use the black glue for this because with the clear, if some excess gets on your own lashes or sticks to the end of some of the fake ones they do dry white and looks odd.
Hope this helps someone!!!