1 up front and 1 down rear gives you a neutral roll center as the over pi height is 0. +1 -1=0. Therefore, it's not a high roll center or a low roll center for that matter.
If you want to raise your roll center to make your car easier to drive (lower the upper arms try may set up which is 0 front and -1 rear with the eccentric bushings. 0 - 1=-1. divide by 2 and the average height is neg 0.5.
What ever you eccentrics are with your kick up mirror this with your roll center. Adjust your roll center slightly different, as per above, to achieve a higher or lower roll center.
Initially I thought run the upper arm flat and either high or low ie -1 front and -1 rear but due to my kick up angle it causes binding.
Understand that you don't have much option with a high or low front roll center because you kick up dictates it.
Good luck
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