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If it's a 60/40 weight distribution front to back, it's possible they should have had more weight in the back. One time at Bonneville when I spun out and had to go to the special inspection they require after spin-outs, they recommended I be sure the gas tank is full so there's more weight in the back. Some guys in rear wheel drive cars try to put as much of the weight distribution in the back as they can for traction, but that's often not good because of the Cp/Cg issue. However, too much weight in the front is apparently bad too, because losing traction on the back causes just as much trouble.
As far as fins, they would certainly help, but I think they're only allowed in the more modified classes like streamliner & I believe, lakester.
Deploying the parachute at the first sign of instability is recommended, but it ends the run, too. So a lot of guys like to think they can "steer out of it", but by the time it's clear they can't, oftentimes it's too late - by the time the 'chute opens, the car's already going backwards. Maybe more experienced drivers can tell sooner whether they can "save it" or not, but in a couple videos I saw, the spin goes faster than the lag in the parachute opening even if it's deployed early.
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