Let's start by listing all of the mid-rear cars in IT factory weight balance. Let me know if I missed any. I don't know much about Porsche I may have missed a few of them.

Toyota MR-2 (90-94) ITA

Toyota MR-2 1.6L (85-89) ITB

Porsche Boxster (97-99) ITR

Porsche 914-4 1.8 (74-75) ITB

Porsche 914-4 2.0L (73-76) ITB

Porsche 914-4 1.7 (70-73) ITC

If you can find these online please post a link to the results I will look aswell.

Then after we find the weight balance for all of these we need to see if there are other cars in the same class as these that have the same, or more of a rearward weight bias.

We need to check against the rear engine cars as well.

I think that will be a good first step. Then we will have to discuss if we think it should get applied to all of these cars equally, or none of them.