Castle 5th scale

[DrKnow65]

blackz97, my turnigy 4S 40/50C 5000mah's didn't really have all the punch they produce until the 3rd cycle or so.
I'd definitely wait for a few cycles before replacing them.

Also I'd be looking at the voltage drop at your highest current moments on the data log and see if maybe the packs are clipping near the LVC at full throttle.
A change of a few tenths on the LVC could end up netting you a fair amount of run time...