AHAHAH no.
You all don't understand how this works. 8 runs, 3 possible shards per run, 24 attempts if you will, with a supposed 30% drop rate.
These are assumptions, but I didn't need to draw any conclusions, I stated a mathematical fact. The chances of that happening are roughly 0.02%. (a 1 in 5000 chance, so who knows) I'm not making a judgement, I'm stating a mathematical answer to an easy problem.
A possible conclusion is that the rates are not 30%.
As far as goes "32 runs I got 6 shards" that's six of 96 possible (bonus) shards, so roughly 6%, if you're including the shards you should have gotten from the node itself, your numbers are even lower.