Larvae L3 biting through plastic lid

I read in a search on this forum that this could be common in the weeks leading up to pupating. I have large L3 larvae strategus aloeus  that are biting through the plastic lid of their container. It is a 1.4 liter container (each) which seemed large enough. And we have changed the substrate to Fresh flake soil as well. Was wondering if this is just common occurrence because they are large and want to get out? Other ideas were possibly too wet, or lack of oxygen? I have drilled lots of small holes into the lid, and the soil has always  been just damp enough to Clump together when you squeeze it but not to leak any water out. Did not seem to be a problem at all when they were the first couple months of being L-3, or when they were younger. But lots of them are doing it now, any solutions any of you might have would be great. They hatched from eggs around the end of June. going to a larger container might take up too much space as we have about 30 of them. , I had to rescue one that had eaten through and gotten halfway out and got stuck. Cut him out and he was okay. Some of them started pushing the lids off and escaping so I tapped the lids shut. Just looking to learn from any experiences you have had as my 11 year old son and I are taking our first go at breeding and raising these. We have raised these L3 from eggs from our mating pair. I had a couple extra Lids, but the most recent hole I duct-taped a quarter Over the Hole to block it for the time being!

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I'm not familiar with the species. When my Lucanus grubs were chewing holes in the lid, I changed to taller containers and kept the

substrate level so there was no way for a grub to reach the lid.

Looks like you have enough air holes.` Without knowing the species, that's about all I can offer you-

don't give the larva a chance to chew through the lids, which often times are a softer plastic than the container.

I check my lucanus grubs once a month, I dump out substrate until I can see the larva, usually at the bottom, 

stir up the substrate I've removed , give them a couple koi pellets and cover them back up.

 
It’s too small. 
I second that, I’d recommend using at least a 16oz. deli cup (should be available at any restaurant supply store) per larva. Besides that, you might have too many air holes in the lid, and they also may be too large. You really only need a little bit of airflow for larvae, and I’d recommend only 5 or so holes in a lid

 
Awesome thx... Not sure if the picure is misleading about size, maybe not but they are 1.4 litres (47 oz.) , with one larvae each. Makes sense about the air holes, I was worried maybe they didn't get enough air! However all of the holes start on an air hole as I guess it's a spot they feel they can grab onto what their mandibles. Lots of scratch marks on the backs of air holes where they didn't break through yet also. 

 
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