I usually feed some sort of organ alongside the RMB's every day and mine have perfect (if there is such a thing!) poops. So, at a guess, I feed way more than 10% organ. More along the lines of 20%+ depending on my supplies.
Alongside cutting back on the bone, you might want to try adding some natural fiber in the form of veggies and the odd piece of fruit; broccoli, carrots, apples, etc., are all good sources.
I have found with Caleb when he would not eat liver it was stuff I bought at the store. If it is liver from organic raised beef, he'll eat it (after I cut it in smaller pieces than what it comes in). Since the liver is the filtering organ, sometimes it can have some stuff in it that has been filtered out of the system like, what ever junk is around. Once I put Caleb on organic liver he was fine. I actually only feed liver once a week. Too much liver isn't good either.
UCDX GRCH Dunn's Marsh Caleb of Waltona UDX3, OM3, RAE Canadian UD, RE
FallRiver's Micah of Waltona GN RAE, Canadian CD, RN
I rarely feed beef liver. I usually feed chicken livers, hearts, and gizzards in a mixture. I don't weight them out differently. I just do part bone, part "other".
If Ernie has had too many bones he does this. Little rocks. Good to pick up, but maybe not good for him.
I give him a bit more yogurt or milky water or vegies. Next day he is fine.
Twice or three times a week I feed a can fish in natural oil. Someone in here told me to that. Never have to worry about amounts of oil to give and it has heaps of Omega 3.