Lightning Field drains 3% (base) once every 2 seconds. Even enhanced, it isn't actually draining much at all.
10 damage (base) every 2 seconds also doesn't add up to much. As a toggle, procs are worthless in it.
Ball Lightning and and Chain Fences both drain 10 or less. So both back to back drain less than 1/3 of what SC drains.
SC from stealth may or may not work. I'm not sure when the "notify" for the mobs happens. But, followed by TB, nothing hit has any End left and has recovery debuffed (the important part of keeping mobs out of End). The recovery debuffs last 10 seconds (SC) and 20 seconds (TB).
Unfortunately, that plan means you eat the Alpha before they are drained either way.
The ATO +Absorb in TB, leading with TB, may resolve that, as the near guaranteed Absorb from hitting multiple things could eat the alpha, at least somewhat.
edit: Power Sink is faster than SC. It may be better to depend on the TB recovery debuff and do TB (+absorb) and PS instead. Not sure.
edit2: In support of a group, the stealthing in/alpha taking are irrelevant if someone else it taking the Alpha.