The old us data collection site was amazing. Lots of info. However you need to take into account that it collected all possible data that users provided, thus the data was not handpicked to compare training on similar skillets.
My not so wild guess would be that 229cm players already had high levels in ID, so negative elastics played a big part in this .33/.04 ratio. On the other hand 183cm guys most probably had a lot more OD than ID, thus positive elastics contributed heavily to the .56/.13 ratio.
BBB: 2 (S37 S38); Top tier: 7 (S35 S36 S37 S38 S39 S41 S63); Cup: 9 (S25 S35 S36 S37 S38 S39 S40 S41 S61)