Excellent advice from above.
Would definitely try splitting them up and if possible......kenneling them with the older dogs or next to them.
You already answered the genetic question. So no excuses later with that one.

Also keep any junk off the ground while you are hunting them....ie...(the extras...or buddy dogs that are thrown into the mix at the last minute)
No other puppies on the ground while hunting yours. Just like kids.....gonna pick up good traits.....or bad from elements around them.
If all else fails.....especially by 2 yrs.........sharp shovel will cure all issues......or sell for finished dogs....no trial !

Jk