Its possible. But in my experience seeds germ outdoors perfectly fine where the sun intensity is about 1300 watts per square meter. Or so.. How far do you have the light? An aircooled 1000w can be around a foot away in terms of regular plants. Not everyone would recomend the same light, but I put my seedlings about 3 inches away from my 250 MH air cooled bulb, which is what I do with my normal vegging plants. Some strains are different. Would probably need to see pictures, know more info. I'm also wondering, are you using two different bulbs with that ballast when you switch wattage? I dont think its very good for the bulb to under/over power it.
I let my seedlings go about 2 weeks without food. Depending on the strain some want it after a week and a half. But most can go 2 weeks or even close to three weeks without food. (I use peat, lime, ewc, perlite, and water with ro water). I think its better to initially underfeed then overfeed if anything. And I haven't really seen much of an improvement with feeding several days earlier, especially if they didn't want it.
That last picture you posted looked great. I wouldn't worry about feeding them just yet. Also want to make sure you let them dry out, enough. It can be surprising sometimes how long they can go, well for me. One time with a bagseed, I let it dry out to the point I could tell it was just starting to wilt. I weighed it (felt it with my hands and also weighed it on my little scale since its only a beer cup) so I knew when was too dry and what was a perfect time. But again, they are looking great so dont let me jinx ya.
Frozenguy
. it's pretty easy to tell the difference i'll add some pics for ya 
SC,
