I have 1.6 60 foot Time Slips. I know what it takes..
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I give you all the credit in the world for what I believe is almost over optimized with your duster for what it has...
All the credit and kudos...
Just keep in mind that increments Below 11.5 on the track in the quarter mile are harder and so are 60-foot times below 1.8...
Don't forget the areas where things get exponentially harder...