Katie - There are a couple of ladies here that will have some excellent advice regarding narrow crotch OSFA - my bub was the opposite so I'm of little help but I think the Ishfly is one??? And maybe the Abbygro - best idea is to take a measurement of the nappies that work for you and go with that

RE - bunching inserts. My DD had trouble with these from about 9mths and these were some things that we tried. Good quality microfibre bunches less when wet than bamboo or hemp and as suse said look for the insert that is the widest you can fit in - less room to move. You might also like to try using two inserts - a microfibre closest to the top of the nappy - ie first part to get wet with a hemp or bamboo underneath closest to the PUL this will give you quick absorption but also the backup of the hemp/bamboo which is more absorbant. The back up should also be able to catch any leaks if the inserts move. And ditto what suse said - you might find after a few month the nappies work fine again and it was just an inbetween stage

Swaddlebees I completely forgot about the pockets! Are you using the hemp or microfibre in these? A combo of both can work really well.

Happyheiny - try the hemp stuffins great hourglass booster system that provides trimness and the ability to combine microfibre and hemp.

Hautes - which size snap are you on and how many inserts are you using? Also are they new ones - within the past 3mths? Do you know if they are the traditional or breathable? It might pay to try them in the dryer on warm and also inspect the PUL for any wrinkling as some of the Hautes have had some problems with PUL disintergrating in the breathables.

Bumgenius also make some fantastic hemp inserts - hemp babies including hemp trifold called little weeds - or the hemp doubler - these can be a little hard to get a hold of but they are a great fit in the Bumg to fix boosting problems.

Good luck and hope you find something that works!