Hey all, I am brand new to On-Roading and need help!
First my set-up:
Associated TC6.2
Reedy Blackbox 410r ESC w/ESC Fan, HD Ext Cap Pack & Programmer
Reedy Sonic 540 M3 17.5 Spec
Yeah Racing Fan on a RSD Fan mount behind the motor
Reedy 6000 mAh 70c 7.4v
Airtronics MT-4s tx
Airtronics RX-472 rx
Savox SB 2261 MG-low profile (@6v - sp .06 & tq 69.4)

I am using Profile #8 on the Blackbox (Practice Mode w/reverse)
SBEC [email protected]
Motor Can timing @20deg (came out of the box like that)

Now my problem:
After I set up my center on the steering (servo), when I was trying to get the car to track straight, at full throttle the steering seems to have a mind of its own! It will start twitching to either side, that is without touching the steering. I have a 1/8th Vorza 6s w/Castle Cap Pack that is setup for speed runs and have a Savox servo on that with the same rx. I have read and heard that Savox servos are power hungry, so I made sure to set the internal BEC on the Blackbox @6.0v, which is what the specs for the servo say, but this thing is possessed!!
Should I set the BEC to a higher voltage? or just get a different servo? or am I missing something that's right under my nose?!?!
Thanks in advance for any help or suggestions!

P.S. - I have pics I can upload of the car if that will help, just need to downsize them, files are to large.