Looking for help from the experts on STINK issues!

First off, I have never had stink issues before.  Nothing changed in my wash routine, except I got a few new diapers!

I use a top load washer, soft water, coldwash/hotwash/coldrinse/coldrinse, often but not always line dry, and I generally use Arm and Hammer Purfume and Dye Free.  Like I said, I have never had stink issues with this routine before.

My only thought is that my little one has been starting to eat some more solids and perhaps I got to complacent with EBF poop and didn't rinse this poop.  There were a few poopy diapers on there and about half of the diapers were brand new.  The new diapers had been prepped with 6 washes and this was the very first time they were worn.  Well I washed them after that first time being worn and all my diapers smelt like poo (all of them, new and old)!  So I washed again a couple of times but with only a touch of soap (like a very little bit!).  When wet, they still stunk so I tried a few hot washes with a regular amount of soap since the less soap hadn't worked.  OH, and the diapers were prepped only using soap in one wash so it really shouldn't have been any buildup on those diapers. After 4 or 5 washes I tried a drying to see if it was just some random wet issue, and they still stink.  I probably cemented the sink into them by drying them!

I suspect it was lack if rinsing the poop that caused this issue, but how do I remedy it?  Do I have to strip? That feels so wrong on new diapers....