I was going to post that the Turbo's differ between engines (I know Fox Classic did!)
It appears the Fox Upgrade fitted to Puma has same Turbo, Injectors, Air intake system & exhaust (Auto vs Manual differ, as does ST line, I assume for twin tailpipe)
Perhaps use higher octane fuel if opting for the higher power Cal, it'd certainly help the ignition control!
I remember the old 140 PS Fiesta only achieved the stated figures if using 98 Ron fuel for this very reason