well first off, you want more solids for tournaments because of the tougher conditions, pearls normally get too over/under on tourney conditions.

I'd say add a T-Road Solid with an aggressive 4x4 or something similar and a Street Rod Solid with the same layout at the Street Rod Pearl.
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I have similar numbers as you MPH and RPMs-wise...my Dimension is 4.5 x 3.5 or so, and it gets down the lane so easily it's scary.  My pin is in ring finger.  I had to get a x-hole to create an earlier rolling ball.  

I would look at getting at least one ball pin-axis to control any over/under conditions (maybe a Street Rod Solid).  My best tournament/PBA pattern balls are all pin under, with 4.5 to 5 inch pin to PAP distances.
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Obviously, you aren't a golfer.
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