Using FM3 Edit, download the preset from Axe Change and before playing anything, use the "Save All Blocks to Library" in the FM3 Edit 'Preset' tab. Then look at the blocks in the preset and decide which blocks you might be able to live without and replace them with shunts (right-click on the block and select 'Shunt' from the menu) until you get below 80% and save the preset. Just replacing the M-Comp block with a shunt drops it down to @ 75%. Save the preset, then switch to another then back and the WARNING will go away.
You can then replace other blocks with shunts to get the CPU lower and add the M-Comp block from the Block Library to see if it's a block you want to use in the preset. You can do the same with every block in the preset since they're all in your Block Library.