Lateral stability... nightmare. 
I've had it big time on the ocasional ELB I've made from skinny offcuts. 
I think I cured it by sawing 'em into 10" lengths and burning 'em 

.
At one roving shoot I saw a Yew ELB that some guy was shooting, it had gone sideways big time and was pulling at about45 degrees to the sap/heart boundary. It seemed to shoot !  

Del