A full shape allows off center strikes more powerful but it isn't possible with maximum edge size in lighter weights.
A concaved shape allows a maximum spine and maximum edge at a light weight. Off center strikes aren't as powerful as a full shape.
A semi-traditional shape is in between concaved and full and is balanced between big edges and good off center power.
A higher sweet spot allows for a more balance bat. The better the balance is the lighter is feels.
An oval handle is said to reduce the twist of a bat on off center strikes.
(e.g. spine running through toe, special toe thickness, special shoulder thickness, copy of current/professional bat)
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