Ditch the FAK.
Duct tape,toilet paper,some ibuprofen, and benadryl for a day hike is plenty.

Get a combo bug and sunscreen lotion and repackage in a small bottle.

Dump two sharps for a SAK with saw like a Victorinox Camper or Farmer

Dump heavy wool blanket for USGI woobie or even better, a Kifaru one.

Add some Sliver grippers or equivalent for ticks and splinters.

Add a needle. Very useful.

Get a Zebralight single AA headlight. Great light.