Tony, like you, my current goal is to greatly improve my spare game.
I'm using one of the approaches described by Susie Minshew in Dean Hinitz' book. You shoot all your spares straight at the key pin, using the same target on the lane, and move your feet left and right to adjust the shot.
I think she recommends using 4th arrow as your target, but I prefer 3rd arrow, 'cause with my extreme right eye dominance, 4th arrow appears to be too far to the left of center for me to be comfortable using it to shoot left-side spares.
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seadrive
Cogito ergo bowl