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I guess it's valid as a development tool if, at the end of the day, after you've analysed the tape (and identified the shortcomings - yours and the cars), you can put what you've discovered into practice and reduced your times.
The other thing of course is that the excuses stop when there is proof!
Bottom line, if the times drop because you have identified areas for improvement (or because know you're being examined) and the reduction is greater than the weight penalty (handling and increase in laptimes) then, why not?
Give it a try.
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