Need advice on nutrients for a future grow.

Hey everyone, I'm currently growing 2 autoflower plants under a couple flouros and cfls with the light schedule at 20/4 but am not happy with the amount I'll be getting come harvest time. The 2 plants I'm growing are Amnesia Haze Auto and Kannabia Hobbit Auto. The hobbit auto is growing somewhat healthy (lots of bud sites, generally healthy fan leaves, nice dank smell with a hint of strawberry, etc.) and the amnesia auto is budding faster than the hobbit but has very little bud sites and fan leaves that curl and feel dry but are very dark green. I'm watering these plants once every 3 days (sometimes earlier or later depending on whether the soil is dry or not) and the nutrients I use are Shultz all purpose plant food 10-15-10. Anyways, I don't need help with my current grow as I'm about 3 weeks away from harvest and its pretty much a lost cause trying to increase my yield. I do however need advice on a future grow I'm planning. I've decided to invest about $700 on a small grow room in my closet. I'm going with 2 400W digital ballasts with an interchangeable light fixture (they fit both MH and HPS bulbs) and some T5 flouros to illuminate the underside of the plants. The dimensions for the grow tent are 48 inches wide by 24 inches deep by 60 inches tall. Anyways, I need advice on nutrients and soil for this upcoming (and future grows). I'll be growing 10 autoflowers for this next grow (5 Pineapple Kush and 5 Auto Pounders) so I'll need nutrients that work best for autos. I was looking into the fox farm nutrient line or something else alongside bud blood. Any advice?

I'll probably post pics of the harvest on the 2 plants I mentioned above when it comes time, but it wont be anything special because this was my first autoflower grow and I was not prepared to grow in this house at all (changed the lighting halfway through veg due to electrical problems, cheap soil, weak nutrients, rookie mistakes, etc...)

I wasn't awre that an auto required vegging. Did you read through treads to find out what the proper light factors and intensities are for autos?

Yes I did. The recommended light schedule was 20/4 on most of the threads I looked at. And if I'm not mistaken autoflowers veg for about 3 weeks and then flower for a month or two. Lighting isn't an issue. I'll set the lights to 24/0 for the next growif need be. All I need is insight on what some of the experienced autoflower growers use for nutrients.

What size pots are you using that you have to water every 3 days? I water maybe every 5 or 6 days during full bloom with 3 gallon and 5 gallon pots. I use an LED too so maybe that's the difference.

I'd recommend Canna Nutrients because they're easy. I use both Canna Nutrients and Fox Farm depending on my mood when I start out. I stick with one or the other through the entire grow though.

I'm using 6 inch pots. I haven't picked any out yet for the grow room I'm about to set up though.

And thanks bro. Looks like I'm going with fox farm soil and nutes.