Is there a way of having the loot split between all the boxes. 

The below example has a min 38 rockets.  Can we get a method to have that divided as well into the chests?

for Example:   
{
"shortname": "ammo.rocket.basic",
"amount": 60,
"skin": 0,
"amountMin": 38
},

Divide Loot Into All Containers - profile setting

Use Stack Size Limit For Spawning Items - config setting

no plans to add another method

So, given what you said it should be splitting items up and it is not.  Our current stack size for rockets in this example is 6...  

It puts a stack of 38 (38-60) rockets in a single stack in a single chest.