8S lipo setup extreme flight extra 78" advice

[remie]

I hope to recieve my extreme flight extra 78" very soon.
Now I'm looking for a powerfull en lightweight setup for it.

Now there are 2 different options for me, 8s or 10s lipo.
the two big differences between those two is the rtf weight.
With 10s the total estimated weight would be somewhere arround 5kg, on 8s that would be somewhere arround 4,5kg.

I've got the following in mind for a 8s setup, but I don't know if it's is going to work.
I calculated a few things with the calculator on the Castle Creations site
sie picture at the end of this post.

The motor I used to calculate is the Neu 1513 F3A with gear reduction of 6,7 :1.
I used a 22x12 APC prop in the calculator (will run something like a mejzlik CF prop for real)

The calculator shows that the thrust would be around 10kg, if this is right that would be very nice.
On a other calculator ( this one http://adamone.rchomepage.com/calc_motor.htm) showed it only wil produce 7.1kg thrust.

The specs. of the Neu motor states that it can produce 2500watt.

does anybody of you have any experience with this setup and this motor, ore do you have any advice for me?

kind regards remie