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In addition to the above tips on launching, you are going to have to go into 4th. Bouncing off the rev limiter is definitely leaving a tenth or two and a mph or two on the table.
You might try short shifting into 4th at 6k like you suggested and note the results next time you are out, but hitting the rev limiter is costing you both E/T and mph.
Also, I'm going to guess you are leaving some time with your shifting in general maybe another tenth or so. Your 2.1 60' isn't that bad, and if you believe one tenth improvement in the 60ft equals a two tenth improvement in E/T (this rule of thumb was never true for me ever), then going to a more respectable 1.9 60ft on streets would only put you at about a 12.9/13.0...again assuming the rule of thumb is true.
If you had a video I could tell you if your rpms were hanging too long between shifts.
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