"Weezard, do sativas generally respond worse to LEDs than indica's?"

Generally, yes.

Skinny leaves, smaller leaf area, and they like to get too tall too fast.
That said, I do have a Sativa-leaner that loves leds.
And the fat-leafed K. O. Kush, limps and gripes until it gets sunlight.
With this small of a sample base it's hard to draw solid conclusions, but generally . . .

They all transpire more slowly under leds due to lack of radiant heat, so water less.
How much they "eat" seems specific to the strain.

Update:
The dryer sheet trick has a glitch.
There is at least one kind of Fungus gnat that can get through them.
Still, it's just an occasional "flyer".
I can live with that.
It was clouds of flyers and billions of root munchers.
Still no root aphids or whitefly.
And no budworms on the short plants.
(I'll tuck a sheet in the upper branches of the tall gals this season to repel the mamma moths.)

Caveat:
We tend to underestimate our pretty purple light.
I've killed a few clones by keeping the light too close.
Same goes for seedlings.

And I watched an otherwise intelligent man purchase 2 UFOs, and hang them 2" from his canopy.

That intensity stops growth.
Way too many photons.
More than the roots could possible keep up with.

He concluded that leds suck and proceeded to tell everybody how much they suck.
Never wondered at the superb results others were getting.
Kinda sad, he's a good grower.

Why am I telling you this?
A cautionary tale.
The height of the light has got to be right.

Your lights?:

'lings stretch?
Get 'em closer.

'lings fall over?
Too close.

Havin' fun yet? :D

Aloha,

Weeze