No doubt - my Storm Trauma Response.
Granted, I had the ball drilled to rev early (to help combat my above average speed), but I still expected it to actually hook and arc on oily lanes. Instead it would just rev up and then make a VERY lazy move towards the pocket (or not at all, sometimes), leaving plenty of buckets and the embarrasing 5-pin. And again, to clarify, this was on oily lanes. I knew better than to throw it on conditions that it wasn't made for.
Anyway, I did manage to find a good shot for this ball -- down and in. It works extremely well for that type of shot. Problem is that I'm not a down-and-in bowler and I only occasionally find a condition suitable for that shot, so the ball has limited value to me.
I never really cared for my violet Brunswick Rhino Pro either. Way too over-under for me. I never liked my urethane Ebonite Turbo either, nor my Ultra Angle (more like Ultra no-Angle!), or my Ebonite Hook Shot (more like "Doesn't Hook Shot").
Maybe I should get the Trauma redrilled with a different layout, although judging from the number of postings for this ball, it may not make a difference. I would've put my Columbia Flipside Wow on this list also ("Doesn't Flip-side Wow"), but then I changed the layout and it works pretty good now.
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You weren't unlucky when you left that corner pin, so shut up about it already!!