The turning should have unwarped them if there is such a thing as warped in the first place.
There are an infinite number of references on this.
The short answer is blank, or slotted unless you have a huge need for the additional cooling of drilled and can afford the cheese grater effect on pad life and the tendency for cracking on all but cast in holes.
Slotted will wipe moisture, and pad sluff which is good at minor cost to pad life.
Blank will be cheapest and best pad live.
For your frequent cold/wet use, I would suggest slotted.
Prices on STI rotors are down under $200 for a front set, and under $150 for rears, so it is no longer a super big deal if you don't like them.
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