WOW. Those are some impressively painted WH40K figs. NIce...
I wondered if the 'issue' with the weapon might have actually been a result of the picture and not the figure itself.
As for the map, might I offer a suggestion. If it won't go in further, take an x-acto blade, a file, or a razor saw and open the hand up a bit to allow it to slide in to the palm. I think it might give you a more realistic look. Consider it this way, you said you want to enter this in a show. Well, I noticed the map just by looking at a picture. Might it be reasonable to expect the judges to notice too?
In all honesty, it is probably not that big a deal, particularly if you are happy with the look. As I indicate above, my thoughts are only about the competition you want to enter.
Like I said, nice work. I'll look forward to more!