I dont think the booster is necessarily your issue.
Bigger MC bore is not a great idea honestly bc you get less pressure but more volume.
Those CTS-V calipers need both- volume and pressure, especially depending on which ones your running 4 piston/ 6 piston.
Check this link before you spend anymore cash on a booster:
https://www.chasebays.com/collection...itsubishi-ae86
Also read this as MC bore size info may be helpful along with his booster recommendations (but focussed on Z32 swaps- but if your running 4 piston may indeed help)
https://importnut.net/300zxbrakeswap.htm#compare