Track power

I have recently built a 5x8 train layout. It has one outer loop of o48 and a separate inner loop of o36. I currently am powering it with two cw80 transformers, one for each loop. The outer loop I want to run TMCC and lionchief plus engines on and the inner loop will have lionchief and conventional engines. Any advice on what to use to power the layout? With just my engine and once passenger car I’m already at 2.5 amps. Thanks