Well having had a natter with my mate, who is a Boba fett nutter but I suppose that's par for the course having had Jeremy Bulloch in a couple of his films. He pointed out that the top fo the dome was a tad too rounded. So was back to weilding the medium grit sandpaper I sanded the top down a tad.
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Luckily where I take the pics of my stuff allows me to take pictures from almost the same place. The red line is the previous height and angle of curvature of the dome the green is the new one. Bit more like it I think and he agreed too.