No, you are still leaving yourself open for danger, you want to keep the breaker sizes proper for the equipment served. Having equipment served by more than it can handle is a very serious risk indeed. If you lose 1 30amp breaker, your crop dies ( minimum damage) Let a ballast fail while on a 30amp cicuit and your home or life may be at risk. Instead, place 3or4 -20amp breakers and split the load between them so if 1 trips, it will not be so detrimental to the crop and will do it's job should an electrical failure occur. You still do not want a device that is rated under 20amps to be on a breaker larger than 20 amps, just a cardinal rule that must to be followed. Remember, electricity only dissiptes in one form, HEAT!!.
You are definently headed the right direction now. I see everything protected from an overcurrent situation. I have not seen a 10amp breaker in a long time..lol I would stick with 20's and call it a day.
I do not think that recepticle is wired correctly, too many wires on it for a 15 amp standard recepticle, the 240 volt recepticles have a horizontal opening at least on 1 side ( nema 6-20R ) and I see the red and white wires above each other on the same side of the plug, there should only be 3 wires total on a 240 volt plug, no neutral is needed, just 2 hots and a ground. It looks to me if you energized that plug right now, you are gonna trip a breaker or see some fireworks. And always wrap the wire all the way around the screw in the direction it tightens ( your wires look like they could come loose at any moment) and then tape the recepticle around the terminals to prevent accidental contact against the side of the box ( I always tape my plugs and switches )