Reved the car to 6,500 rpm and hit 160-180klms a few times.
On a closed racetrack in a fully controlled environment yea?

good stuff! good to see its all worked out properly.
As for the light steering, perhaps later at some point (if desired) you can adjust the weight of the system by replicating some of the high end cars, EG, Porsche.
They use a PWM valve that bypasses the pressure line out of the pump back into the resevoir, all internally of course, but no reason why it cant be done externally.
They increase the PWM rate the faster the car goes, effectively bringing the weight back into the steering at high speeds, to reduce the twitchy feeling yet still allowing full power control at low speeds for comfort and parking assist.
Depending on the ECU fitted (if you do have one) some have PWM outputs that are 100% configurable.
That may be able to be mapped and varied against the road speed input.
Would effectively allow you to dial in the perfect weight exactly how you want it and where you want it.
May not be relevant to you, but good info to have in one spot for anyone else considering it.