HELP!! Leaky diapers...again

I was all excited about my GroBaby diapers when we first got them.  Since then the excitement has waned a bit. :(  We continue to have leak issues.  I never considered Squirmy a heavy wetter, but we've had our battles with finding sposies and cloth that don't leak every time we put them on.  I'll give you a leak here or there due to user error or just sheer tricks of nature (seriously, how can so much come out of someone so little?!?).  But certain sposies and certain cloth have leaked nearly continuously.  I was so hoping GroBaby wouldn't be one of them.  I love how cute they are and I love the hybrid ability for longer outings.

Someone out there MUST have some solution for me.  Please HELP!

Here's the deal.  Squirmy leaks pee out of the BACK of diapers!?!?  The back of the diapers are never wet, but the front is soaked and his clothes are wet in the back.  The only thing I have been able to figure is that he's overflowing the front area and it leaks up, out, and down around his waist.  He's done this consistently in Huggies newborn diapers, gDiapers, and now GroBaby dipes.

When the GroBaby dipes started leaking, I was chalking it up to not fully prepped diapers.  Now they've all been fully prepped and are still leaking.  If I put the extra soaker pad in they are really bulky and gapping in the front (he's skinny and long).

Today I put the diaper on him, played with him for about 30 min before he decided he was tired and wanted another nap.

I dressed him and put him down, only for him to wake 30min later.  When I picked him up, I knew why he hadn't slept very long...he was WET!

Please, please, please!  I don't want to give up on these :(