My ds is a super heavy wetter. He is in Motherease and some Little Lambs. He has a nappy with built in booster, plus a terry booster then liner during the day, and a super/extra/ maxi hemp booster at night.
I would give a big thumbs up to Motherease airflow wraps - they are the best.
My ds had a clammy bottom until i bought some fleece liners. They are so cheap (£3 for 6 on ebay, or make them yourself!) and they do an AMAZING job! They wick away all the moisture from his skin so it feel totally dry. In fact he can be wearing a nappy that is soaked, and yet if i press down on the liner it is dry to the touch. Amazing!!