DRG AoE combo issue

[Ing-Dono]

Presumably it's to encourage you to alternate combos during single target play. It's worth noting that the two complete six step ShB combos together take up 29.16s

Hold on a second, six steps? Raiden Thrust is an upgraded True Thrust. From Raiden you can continue into the rest of the combo.
So if you can hit your positionals without fail, you'd only use True Thrust once in the entire fight, not counting stuff like transitions breaking your combo.
So your gcd rotation will only be 10 steps long [True > Disem > Chaos > Wheel > F&C > Raiden > Vorp > Full > F&C > Wheel], I currently have a gcd cooldown of 2.48, the full rotation would be 24.8 seconds long (assuming no faulty weaves etc.) while the 10% damage buff will come in after the second action, you should be able to keep it up 100% of the time if your sks is high enough. Worst case only Disembowel isn't boosted by the buff it provides.