Putting the pin under will make the ball start-up earlier by lowering the RG value of the ball...this will also make the ball arc a little bit more. Pin up will increase the RG value...so a little more length and backend. The Thing Lives out of the box will hook more in oil than your Thing Returns so you could let he coverstock be the difference between the two. What I would do is leave the weight hole out of the ball till you throw it side by side with your TR and then decide where you want the hole to go.
My $0.02
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-Chris: DJ's Pro Shop : Auburn, MA