Make it cost one CRAM to mine in the idle game and 1/3 CRAM to attack. The CRAM is immediately burned. This will increase the value of CRA. Once CRA is more valuable, people will breed a crab 3, 4 and 5 times which will burn more TUS.
I think something will still need to be done in order to burn more TUS besides this.
Maybe there should be an annual TUS and CRA halving on the idle game. These are my thoughts.
If you don't adjust the IDLE game, we will just print TUS into oblivion.