I can email you a article on the rico layout if you Pm me your email address.I think in the article it explains what exactly the X-Hole is for and I believe what you are asking is exactly why you put the X-hole.
And yes I have had a ball with the Rico layout and no I did not have a problem with it flaring over fingers or thumb.
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Don Smith
F.O.S. To The Bone
Cobalt (X2),Tsunami (X2),Pearl Uranium,XXXL
thats just what I carry
Cobalt Bomb (NIB),BCB(X2-1 NIB),XXL,
Buzzsaw C/Carbide,
Original SD(X2,NIB),Golden Nugget,Pearl Cherry Bomb (X3-1NIB 1 is 16Lb)
SCB,H2O,Pink Raspberry (X1-16Lb)
And Always Looking For More