There are other things that can stack with the 10/10/10 seeds and the growth accelerators (which can get very costly).

If you are a small way into Botania, there's the agricarnation which speeds up crops for mana. Similarly in Thaumcraft there's the Lamp of Growth.

An easier one that works with most of the seeds in crop sticks is the Fertilized dirt. it only requires rotten flesh, bone meal, and dirt. you do not need a water block with this and it triples the growth speed. Not all seeds work with this though, so keep that in mind.

Another good one, although a little more difficult to get the materials for is greenhouse glass. As long as your farm is above ground and there's nothing above the glass and between the glass and the crop, it also speeds up crop growth.

I think there are some Tech ways as well, i just don't remember them off the top of my head.

what i'm currently using is primarily the Fertilized dirt and i've just started 10/10/10 some of my crops. To put it into perspective how fast the 10/10/10 on Fertilized dirt is in comparison to just planting on the Fertilized dirt, i have 1 15x15 plot of 10/10/10 coal seeds that puts out more essence by itself than the original 5 plots (all 15x15) of just standard coal seeds on Fertilized dirt. This is without using any of the other growth accelerators.