Hi,
Sorry for the slow reply TGG, I have had a few things going on!
I couldn't say for sure on the guard rolling on the rear since I had already rolled them for my previous wheels but I think they would probably need a touch from standard, but I do recall having to get the roller out for the fronts. I think from memory they only needed a bit to avoid grabbing when the suspension saw bump with a bit of steering angle, the right had caught the lip and pulled it down at some point.
In other news while I am waiting patiently for my new turbine housing and I already had the splitter off to remove the sump, I decided to get stuck in and fit the front lip that I had sitting around for some time. You can see in the first image below the "temporary" airdam that I had made from the same material as the splitter. While I was there I also decided to remake the tyre spats which didn't really fit well and came very close to touching the corner of the tyre at full lock.
I have not quite finished them yet but there is an image below of of one of the new canard type spats sitting in place. I have not tried them yet and cannot say that they are exactly state of the art but they were relatively simple to make being made from the same aluminium composite panel as the splitter. They also take a little inspiration from the Peugeot 405 which Ari Vatanen drove to set the record at the time at Pikes Peak.
The original splitter/airdam assembly fitted:

New front lip to be fitted:

New front lip after fitting the splitter also:

The Peugeot 405 because its awesome:

Canards/spats sitting in place prior to completion:

Cheers,
Tim