Unfortunately, I don't think there is a Hacker clone.
Until recently I always thought the higher the C rated battery pack the better. My new school of thought is to only use the highest C rating necessary to get the job done.
I've used the G Force 1300 40C packs from Value Hobby but they weigh 4.5 oz. I'm no "weight weenie" but in the case of the Sabre light weight makes a very big difference in the way this plane fly's.
I did splurge with the tail servos by using HS 65's but I went with the nylon gear versions verses metal gear.
Just checked my CG for the first time. It's 5 3/4" which is about an inch rear of the rear part of the aileron servos. I don't know what the spec is but it seems waaay back. The plane is very controllable but loose. No bad traits at all. Nice KE with no pull, etc. etc.