Maybe you just need to fasten it tighter? The rise seems fine to me - LIli's a little on the small side but is 18 months old and they fit her fine with the front folded down, ie not on the highest rise setting! I agree about the absorbency (fine but nothing special, but they're pretty slim so that's to be expected), and I hear you about the variable weeing - I've had a nappy 'last' 4 or 5 hours before and barely be wet, but that's not because the nappy is fabulously absorbent, it's just because Lili only needed to pee once!
I have one, and I love it just for the fact that its gorgeous but Molly is not heavy wetter and she soaked through it pretty fast. Saying that though, it was new and had only been washed once so the absorbency might improve. I love how stretchy it is as well, it seems like it will fit for ages! It is my favourite fitted nappy (well, compared to my WNNLs and Swaddlebees OCV, they are softer and cuter ) but too expensive to buy more of
I know this post is a little old but i thought i would add my thoughts incase someone searches
I have been using GM's on my DS who is 8 weeks old for the first time yesterday and today and i LOVE them, they fit nicely (with the rise loered down at the front and I have also taken the double booster out and just use it 'empty') and they have been lasting around 3-4 hours and only feel 'damp' on the outside! DS has been out wee'ing everything and yet today he went 3 hours coverless in a a GM...he napped in the moses basket and everything and the outside was pretty dry! Im thrilled with them and have more on the way!!