Hello X-30!
A couple of questions on your 8s setup, which I am also considering for
a Hacker A60-5s-V2 (295k) I already have.

How much did the CG move when you went to 8s? Weight of 8s packs?
Is there a need to move the rudder servo back to the tail?
On the APC 18x12 - how many watts output are you getting?
What is the all up weight including 8s with this setup!
Many thanks in advance!

To JAS
Did you check the wing incidence? 0.5 deg?
Is there any way to fit adjusters?
Thanks