DSE Mini-Tub vertical panel angle fitment?

[bluespeedball]

As the title states, Im currently installing the DSE Mini-Tubs, upper shock cross member and triangle cut outs for exhaust clearance. So, my question is in regards to the Mini-Tub vertical surface that you can visual see from inside of the trunk. I did the measurements and traced out my cut lines per the instructions but my tubs appear to lean "in" as if i did not trim enough. I will try to post some pictures later if Im not explaining this well enough.

Measuring my completed drivers side I have 15 1/4" from inner wheel tub to outside lip of quarter panel. On the passenger side I will have just shy of 15" but the passenger quarter panel has been replaced and will be addressed at a later time. Since this is my first install I am unsure of how important this 1/4" should be.

So, after reviewing as many online install pics as possible, DSE website and other information on this site I cannot get a definite answer of if these tubs have a slight lean to them and what is the appropriate measurement from inner tub to outer quarter panel.

If there is anyone currently at that stage that can provide some information I would greatly appreciate it!

Thanks!