Disclose the probability of getting specific Datacron abilities when rerolling

In the last datacron set I rerolled a Nightsister level 6 ability 5 times trying to get the 'best' ability and it never came up as a choice.

This set, I got two unaligned force user DCs and after rerolling their level 6 ability a combined 8 times I never once had the option for the wordy 'best' ability. If the probability of rolling an ability were truly uniform then there would only be a 0.25% chance I was so unlucky.

I don't remember it being so difficult to reroll to a specific ability (out of 5 possible abilities)  3 or more sets ago so CG has been tweaking the probabilities of rolling abilities. They need to disclose them and document them along with the abilities, just as the document the probability of getting different shard counts in packs.