I think there is a command (tpt.el something), but making a save with it won't work because you have to enter the command every time you load the save. You could try using layering to put more tnt in a smaller space, search for a tutorial ingame if you don't know how to layer.

Factorial:

Use THIS save for instructions on layring.

 

1322816View Save 1322816

 

Also, with DEUT it's !set life deut 65535 (Because any higher values does not get saves or stamps correctly)

(2^16) - 1 = 65535

So, life must be stored as a 16-bit unsigned integer then.

Ok, use Factorial's second method if you are only using tnt, but if you decide to add c4 or another element it is quicker to use my way.