Hey Disco,

I am also just finishing the same conversion
My setup is as follows

Hacker C50XL 6.7:1
TP 8s4p 8000 mAh (2 8s2p's parallel)
(5) Hitec 5945MG
Jeti Opto 77 amp controller
30 volt UBEC
21x14 APC Electric prop
Tru Turn 2 7/8 Ultimate lightned spinner
Airtronics Stylus PCM

Weight: 10.5 lbs
WOT Amp draw: 67 amps
WOT Power: 1937Watts
Above measured on a full battery with Astroflight Whattmeter


I went with the 4p pack because I was really concerned about having to add weight to the nose.
As it turns out I was actually able to move both packs back 1" to 1.5" from the back of the firewall and balance right behind the wing tube. I had talked to Michael who did the original conversion and write up and he used a 8s3p and had to add 6oz to the nose even after adding spacers to the motor to get it out an extra 1/2 inch. I did not space mine out and was still able to balance with the 4p pack. Hope this helps some

Regards,

Tim Hudson