Increasing entry angle for the righties would, imo, work against them. Can you imagine leaving a stone 5 pin? The way you now leave a stone 9 pin? No thank you. We all structure our games (I hope) based on the normal alignment of pins on the deck - change that and our game is useless. It may be more obvious that this would screw up the left side, but it would create problems for both sides.
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"To plunder, to slaughter, to steal, these things they misname empire; and where they make a wilderness, they call it peace." (Tacitus)
"If one tells the truth, one is sure sooner or later to be found out. " (Wilde)