Fujiwara,
The weight of your hammock is bothersome.
I have a 12.1 ounce (343 g) hammock with full netting (removable), and it would be easy for you to obtain a similar one if you wanted to.
May be not 12 oz, but you could get very close.
Dangerbird at 1076 g is way too heavy for a backpacking trip like yours.
Two pairs of trousers is 1 pair too many.
I'd ditch 3 of the 4 books you listed. "The ultimate hang" is definitely a deadweight, as it is one-time book – you read it once (when you get into hammocking) and then can toss it – there's no knowledge in it that is necessary to re-review on a continuous basis. The SAS survival is another book that one does not need to carry around – you learn from the 1st read and toss it in the "garage sale" bin.
275 g towel is outright crazy, you need a 60 g one and be done with it.
A 78 g bottle to carry 710 mL is another dumb thing – most 1L throw-away bottles from bottled water weigh less than 25 g. Besides, if you want to use a Sawyer-mini, you will quickly learn that you need a "scoop" – a vessel to take the water from the source into your "squeeze vessel" of choice for dirty water, which I also do not see in the list (the 16-oz one that comes with the Sawyer-mini is a joke!).
What is the CRKT Kangee for? I don't see a cook kit listed at all, meaning that it does not seem you need to build fires….
Carrying 20 kg of food from get-go is a dumb approach – there are plenty of places in Greece to replenish your supplies. The Greece mountains could fit into a poststamp, the entire country could be hiked in less than 20 days in the longest direction (islands aside). Unless you are a 5-mile a day hiker….
Otherwise, I (almost) agree with Bob Gross – you will last about 3 days before bailing out. Maybe 4 if you are of the stubborn type….