Your plants are looking good! Mine were much farther along by July 1st when you started yours, so yes, an earlier start would certainly get you bigger plants. From what you started with, though, it looks like they've really taken off! Mine have officially begun flowering. It's been a solid week now, so I would suspect yours should start soon. Can you see any calyx yet? Hopefully your girls will kick into gear. I haven't done any pruning, only pulling yellow fan leaves after they've done their job. My taller plant just took on that shape all it's own. It's very uniform. One thing to keep in mind is making sure your pots stay cool. Too much sun on them and it will raise the temperature of the soil with can inhibit growth. I'm lucky with how my house is situated, the plants get full sun while the pots stay within the shade line of the house. I believe that's been a benefit.