Sorry Damo, missed your post.
I run a 215\45\17 Federal 595-evo on the front. 235\45\17 595-ss on the back for drift.
For time attack it was the same, but with Toyo R1rs on the back.
I've got those D2Rs but I didn't run them at the time attack because one of them was too worn out They're a 265\35\18, Dunlop Semi slick Medium compound, fkn amazing they are, just need to get some more
That's some interesting research you've done there Toffy, what tyres were you using?