I'd be tempted to run something similar to a Garret Gtx3582r with a. 64 housing at around 1 to 1.2 bar.
Or a gtx3076 with a .8 rear housing at 1.8 bar.
And if it's going to be a dedicated time attack car I'd get rid of the factory gearbox and go for an r154 and also change the diff, so your gearing will be completely different anyway.
Factory gearbox/diff are fine for street and ooccasional track days but would probably give up in a dedicated time attack car.
These are only my thoughts and ideas on what I'd personally do different, so take them with a pinch of salt as you should with anything from the internet and discuss it with your tuner aswell