That's what I'm saying: The Zed came with 040 on from new, and was probably setup with those tyres on from design stage. Nissan then switched to the 050A with the HR car, and it's identical in chassis design. It's all about the money involved, don't get hung up on it.
If you want outright wet performance, you need a winter tyre and accept they'll be hugely compromised in the summer. Otherwise the MPSS are as good as you can get. The reviews saying about sticking with OEM tyres are not worth listening to IMHO.
Softer sidewall will give a more progressive feel and compliant ride, but you'll lose the immediacy on the turn in. Again, the MPSS are the best in the field here, and if budget is no issue then I wouldn't look any further. A tyre with less natural grip (FK452 or VUS) will have the TCS kicking in more often, but you can drive around that.