I’ve seen larger discrepancies like that before and there actually not that uncommon but most cases seem to be amongst athletes who are either LJ specialists or TJers with poor speed or elastic abilities. The double-double is much more reliant on starting strength and low-end power than the actual TJ event.
Note, that it’s probably more accurate to adjust by % rather than an absolute distance. For example, a 1 foot adjustment might be appropriate for a girl jumping 10.5m but for a guy jumping 18m the discrepancy is going to be much larger but still proportionally the same.
ELITETRACK Founder