Ok, right now my plants are about 3 to 4 inches tall, they have been like this for about 4 days now. I just feel like they just aren’t growing that fast. Each of them have about 4 to 5 leaves around a inch long. Here is what I’m doing right now. Right now I have soil that has some built in plant food. It has (N) .14% (P) .11% (K) .08%, I just started to use plant food also, called Miracle-Grow, I know it's not recommend, but its 15-30-15, so it should work fine. My question however, is I believe my ph is at about 7.0-7.5 could this be causing a problem and also, should I wait for the soil to be completely dry, because sometimes I feel like I’m watering them once or every other day. Then Lastly, right now I have them in just regular cups. (beer bong cups or party cups) Should I take them out and put them into bigger pots could this also be why they might not be growing as fast.

Any suggestions would be great or tips thanks.

You diff need to repot into at least 2 gallon pots. Stop feeding them that mirical grow as you need some thing more like 10-5-5 or 20-10-5 you are over feeding them. They needs a higher amount of N durring veg. Higher amounts of P & K during flowering. Get a water meter. Water everyother day (max) unless your plants droop from lack of water during that time. Ph must be 6.2 to 6.8 for fastest growth.

that sounds like alot of water 4 such little plants try sticking your finger in the soil an inch or two if its still moist then dont water.from what ive gathered you want the roots to seek water to grow bigger

UPDATE!!!
Ok, I got new pots, probably around a gallon. However, I went and looked for different kinds of plant food and I found one that was 30-10-10. This should work for veg. stage correct? However, the only thing is made by Miracle-Grow but it was the only thing they had close to the "calculations" needed. Also, does anyone have any suggestion on where to get a PH decrease liquid. I have went to every hardware store no one has one!

Hydro store will have that ph down. Get Fox Farm at the hydro store too.