Foc is more important with trad setups when tuning carbon arrows as they are normally very stiff in spine and also relatively light in weight as well. Heavy inserts and/or broadheads decrease the shaft spine and increase arrow weight, especially tip weight and I believe it does make a difference in penetration as well. I can shoot my arrows with 100gr inserts and 125gr tips without any fletchings out to 30-40yds with no problem and that is when I know I am tuned perfectly. I always bare shaft tune my setups with the desired tip weight I want to shoot and trim down shaft length to adjust and it works plus it gets my arrows up in the 500+gr range that I like as well.
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