Nice kit - my suggestions pretty much follow the previous posts:

1.AMK sheets v old spce blankets
2.Knife - even a very small folder would be a good addition(alox SAK maybe? One with a blade and a saw would be very light and useful for converting local trees into useful things like shelter posts and fuzzsticks, and converting caught fish into cookable chunks)
3.Water bag and puritabs - if you can't get a fire going for some reason
4.Anti-spasmodics - if you are in the wilds, getting the squirts is real nasty, quite dangerous and stopped with a tiny pill
5.Whistle - natural partner to the mirror

None of this is heavy or bulky, and should help you a bit