As I was working on these minis, I noticed that they appeared to be advancing to an angle when placed in the typical GW slotta base. So, I clipped the trailing foot off of the slot in order to reposition the mini on the base.
In the pic you can see the effect of the repositioning. On the left is the original configuration, and it is (in my opinion) advancing towards the corner of the base. On the right is the modified version, and is advancing toward the front. Hopefully, the mini will stay glued to the base after the modification.