Welcome PBR. You've already started posting and that's a step in the right direction. This is one of the better forums for bowling on the net.
To add to what CoachJim said, which is all in the "pocket", so to speak, many drillers believe that a stretched span is the way to go and that it adds revs, which really isn't true but at the same time it adds inconsistency, causes hand fatigue and increases the chances of injury. So before you think of stretching the span try the test CoachJim described.
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Calvin's Highs
Career
HG:300
HS:763
2008-2009 Winter Season
HG:277
HS:673