First Ever Grow!! 5 plants 2x4

Sorry for the late post guys, life is bonkers atm. We are in the process of moving, so my time has been split thin lately. So, the pictures are a day or two into week 3, but they seem to be pretty split as far as performance. The 2 plants in super soil are kickin ass and are beautiful! Lots of foliage growth after defoliating beginning of week 2. The others... well I still love them, BUT... As you can see, the random bag sees looks terrible(best Charles Barkley voice). It’s growth has been very slow, it has not responded well to topping or defoliation. I’m just letting it grow and hoping it comes back with a vengeance. The other 2 grape punch not in super soil look much better than the random seed, but pale in comparison to their S.S. counterparts. I believe that these little white larvae have taken their toll on the other plants, where the SS plants were able to fend them off better, or that’s my best guess anyway. My neem oil arrived today, and I kept wondering if the SS was what made the difference for the 2 healthy plants. So here’s what I did. I removed topsoil from the 3 lagging plants until I saw roots. I then put maybe 1/8 to 1/4 inch thick layer of SS in each plants pot and topped off with happy frog soil. Then I mixed 3 tablespoons of neem oil into a gallon of water and sprayed around 5 ounces of that solution all over the soil of each plant. I will be reapplying the solution every other day for the next week and check for larvae again. I’m hoping between the amendment of SS and neem oil, I can kill these things off and bring vigor back to the 3 plants. Any experienced growers that see glaring red flags I’m missing or have an easier way to do it, please lemme know!! I’d really appreciate it.