So, bone meals, blood meals, kelp meals, etc. can all benefit.
During the veg stage it is important to be high in nitrogen as that is what promotes growth.
So, you'll want to look for higher nitrogen organic meals to help you there. Before you buy them though, I'd ask yourself if you want organics or if you feel you can do without. Cost is the reason for this. Organics are of course more expensive.
Once you've decided, then it's time to consider how you want to add these fertilizers. Do you want to feed this with your DynaGro as a water soluble? or do you want something you add the soil?
For water soluble fertilizers, you may look into soybean meals, amino acid blends, kelp powder, some blood meals, etc. if you want water soluble organic fertilizers. If you are okay with synthetic fertilizers, then you may want to consider what Dynagrow is lacking before choosing. Dynagrow has calcium and magnesium in it already, so adding more of that may not be necessary. But, it's lower on potassium, so, you might want to add a little potassium nitrate(salt peter). 1/4 tsp/gal will be fine and will be a fine addition to the dynagro you've chosen. You may also consider adding 1/8 tsp/gal calcium nitrate and magnesium nitrate as well.
For non soluble fertilizers that you add to the soil, you'll find kelp meals, feather meals, and many more.
I'd be happy to give you some suggestions on how much to add once you've chosen something to add. Organic fertilizers are all over the place, so it's tough to say "add x of this and x of that".
