So there is a way to give those guys an assist. Since the roots aren't pulling up proper nutrients in that chunky soil you can start to give them a tiny tiny little bit of dissolvable feed in their water. Most people will say you should never feed the tiny sprouts and usually they are correct. However in this unique situation the chunky wood chips are just not allowing any good nutritional uptake so therefore the plants will likely start to show signs of Nitrate deficiency. They will start to get a little bigger but the leaves will start to turn yellow. As soon as you start to see that yellow fade that is the time you should start ever so slightly adding a tiny tiny bit of veg fertilizer and CalMag in the water. Just enough of each to just barely change the color of the water to your naked eye. Mix it in a clear glass so you can hold it up to the light and give it a look, you don't do to give them too much. Start with that for the first few waterings and watch the plant. If its still staying yellow then next time you mix give it a tiny kiss more. Look at your water color and mix it a tad darker than the last time.
If you keep doing this very slowly and gradually you should eventually start to see the green color flush back into the leaves. Once the leaves turn healthy green you can stop. Let the plant start to catch up eventually once it gets to a descent size it will be able to start pushing through the Kellogg chunk easier.