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Best I can do at the moment. The pic is with CR6ZZ Avons 175/70/15 which were fantastic in the dry, but were horrible in any standing water. (very "snaky") hence the change to the Sprint Classics. Note both tyres are the same size but the Avons are slightly larger.(Why?)
Difficult for me to comment on ratios, as my 4/4 has the modified Diff. However when she was factory new she was shod with Contis 165/80/15s. Aaaaaagh hopeless tyres (note 11 years ago-New ones may be different) I spun the car at 25mph causing 10500 quid damage. Really upsetting.
If you are worried about the speedo reading that can be altered. Their is a thread on here on how to do it. Mine with the different tyres & diff is accurate to 1 mph at 30 & 4mph at 70.
With the Sprint classics fitted a track day was great fun. Could get the car to 4 wheel drift by feathering the throttle but never got the back to hang out. My ability I suspect, & did not notice any significant under steer. What I did note was 2nd-3rd did not really suit Snetterton, as coming out of some corners 2nd was too short & 3rd too long to keep in the power band above 4000rpm (Variable Cam change point) She does accelerate very quickly in 1st from a standing start, must check the top speed in 1st,&2nd.
Using 22psi front & 24psi rear the ride is good with the new springs & Dampers (another thread). Can't say I noticed much difference with the other tyres as the ride was awful anyway, due the problems with the springs, frame & dampers.
By the way I know someone who has different tyres front & rear. Each to his own, but I think the 175s look just right on a 4/4. Not to thin nor to thick.
Hope that helps.

4/4 Ivory 4.1:1 axle, Mercedes A200 AMG