Ended up just above 3k, which is fine. Just wanna get above 4000 these days, the rewards aren't terribly different from there until the really high ranks.
Akainu ranking is butts. Threshold, rewind, and sailor blow-aways, gotta account for all of that plus actual damage. Note that Akainu seems to blow away the same positions based on the buff, and multi-buff specials (Cracker, WC Ace), will default to just one of these. Got to 8 million with double Suleimon, RR Cracker, Wild Zoro, Bobbin, and WCI Brook, but I won't be able to get any higher there. Might just wait for something that doesn't require an unevolved legend (WBv2 would be quite useful).
EDIT: Got it. QCK Garp Captain, Rayshop Cora and WCI Brook on the left, Bobbin and World Clash Ace on the right (with Ace in the bottom right), and unevolved Luffy/Ace Friend Captain. Use Cora first (who doesn't set chain due to the rewind, avoiding a launch), then Brook, Bobbin, and Garp. Then use Ace, who gets launched, then you can use Luffy/Ace for their better CA, avoiding a launch again due to orbs already being boosted. Then just attack with all perfects ending on Bobbin due to his sailor ability.