Yup, your voltage looks right. Sometimes it'll be as high as 87.0V hot off the chargers.
I'd recommend testing it on a bike with the CA. ~77.7v means you should be done, but you have a little wiggle room left. 76V means turn that controller off, period, and pedal. The chargers will complain a little when discharged that low, and you'll get the single blinking light for the first 10min of the charging cycle. Go any lower and the voltage drops off very, very fast. If a cell hits zero, it's dead.
Of course, I'm talking about the resting voltage, when your hand is off the throttle. You'll see something like 8v of sag under load, which is normal.
You'll actually see 5.2Ah to 5.8Ah, depending on how hard you ride. If you're hitting your low voltage cutoff before 5Ah, something's wrong.
What is the maximum current of the controller? Is it a 50A one? The cells are good for 10C continuous, 15C for short periods. That's plenty of headroom for a 50a controller, and you can increase that current limit a bit without harming the batteries, if you decide you want to.
At the end of a hard ride you might find the batts are a little warm. This'll be normal. If they're hot, or if some packs are hotter than others, something is wrong. A bad connection somewhere in there could cause problems. I would make sure to test that both strings of three are really connected in parallel before putting it on a bike. Make sure each set of three individually is at the expected voltage.
These cells are happy about being charged in parallel, and they will self-balance if in parallel. After sitting wired like in your picture, each set of three will be at exactly the same voltage. If for some reason you can't normally charge a pack, you can put it in parallel with another at a similar state of charge (connect the Andersons, red to red, black to black) and put the good one on the charger. As the charger tries to charge the pack hooked to it, the second pack will leech as the first increases in voltage, and both will finish charging in about twice the time. Or if you only have one charger, you can connect all the Andersons in parallel and put one of them on the charger. It'll charge all six in about six hours. Though, there's a good chance the charger will have to be disconnected and reconnected every hour or so, since it'll give you the "damaged battery" indicator if the pack's voltage doesn't rise fast enough. No worries, this is just the smart charger being mildly smart with you.
Oh, and be careful getting on the bike the first time. An x5 at 84v with 50a will have crazy torque, and (with the rider sitting upright, motor in the back, and the batteries sitting above the rear wheel) it will try to wheelie and throw you off the back if you're at a stop and then hammer the throttle. I've found that this happens more often in front of cute girls.
I'd recommend doing a shake-down at 56v for the first test ride. Run just four packs the first time, partially to to avoid the above the first time, and because you'll want to make sure everything's secure and that your donor bike is fine. Then add the other two packs.
