I need some serious help with cloth diapering!

Brittany💚💛 • I'm 26 years old from New York. I'm currently pregnant with boy/girl twins! 💚💛Due December 2015!
When I was pregnant with my twins I invested in a lot of cloth diapers and a couple different styles of inserts. EVERYTIME I put a cloth diaper on either they leaked. They seem to fit around the legs, but always leaked.  My son is a super heavy wetter and my girl is a poop machine. I feel like I have wasted a great deal of money, and disposables for two babies is just plain ridiculous. 
Any suggestions of what I could try to fix the problem? Any particular inserts that are best?