The CR you pick would depend on your cams and low end torque you're aiming for. The Mazda Skyactiv engines can run 87 partially because the headers are tuned but partially because the engine runs at lower volumetric efficiency (via abnormal cams or cam timing most likely) and thus has lower torque output. Note the mediocre torque output, despite having tuned headers, DI, etc.:
With stock cams and I/E piping on an FA20 going to a higher CR is probably not going to work. With high duration intake cams, there will be lower VE, lower torque, and effectively lower compression so you could go higher.
That said, 13-13.5:1 is probably a good place to stop regardless. Raising the compression ratio increases temperatures in the combustion chamber and the forces on bearings, so there's diminishing returns as you lose more heat to the heads and energy to friction. Higher would be good for fuel economy but wouldn't do much for power.