Not sure how I missed this topic, love these things;
Steel Vengeance - Yeah it's the cutback which is clunky, downward barrel roll ala Storm Chaser would be the bees knees.
Zadra - Another half lap with lots of airtime finishing low under the wave turn.
Lightning Rod - The original was almost perfection, I do think they could have done a lot more with the momentum at the end though, a forceful turnaround into a zero G then brakes would have finished it perfectly. However, the new ride seems to not be a patch on the prior version.
Skyrush - New style restrains/clamshells, wouldn't change anything else.
Taron - Remove the trims from the airtime hills at the end, maybe add a downward heartline to finish.
El Toro - Retrack to fix the pot holes, revamp the finish as ended a bit slowly, twisted hill after RT hill, sharp right turn, brakes.
Storm Chaser - I dunno, it does loads with it's size, maybe transport it to a nicer place, it's setting is awful. Or different restraints, minor quibble though.
Helix - The usual, dial up the launches by an extra 1or 2 mph, reprofile the final inversion to be exactly the same as Blue Fire's, reconnect track. I will die on this hill.
Outlaw Run - Remove the last inversion, it doesn't need it.
Fury 325 - It also suffers from the B&M brakerun syndrome, extend the ride along the midway. Also align the large hill before the helix to the right a bit, remove the helix and have forceful turns and airtime hills zig zagging to the end.