At the end of the day it's all up to the GML if they will allow or not, some do and some don't. Personally as a GML if you can get away with a rectangle, up to say @40mm and not triangle I don't think it's too much of an issue, but having a triangle appearance doesn't look very nice.   Quite a few troopers have the larger cover strips due to their size and the size of the armor. Many do add larger cover strips on the rear, it's a better look than having them too big on the front.
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