stubborn hair left behind after epilating

im using veet epilator time to time between shavings. i notice that no matter what i do (exfoliate before epilating, blowdry technique suggested here, slow and fast settings), i always end up with some stubborn hair left behind that i have to follow it up with shaving. what should i do?

What area(s) are you epilating and how thick is the hair?

underarms and they are pretty much medium thickness