Back in the days when there were less maps we played every map back to back
Ooh a little higher, now a bit to the left, a little more, a little more, just a bit more. Oooh yes, that's the spot!
No, you cannot use the colonist value listed on the expedition cards in hand to augment a found colony action. You can only use the value on the flipped cards and the colonist value on your success track. Expedition cards are only used for their actions or scoring at the end of the game.
AND any pure colonist cards in your hand of course.