Uncollected 4 hour crystals

I had been saving them up so I can get a decent idea of the drop rates and either I had the worst luck imaginable or the drop rates on revives are horrible. 156 crystals and I got 2 lvl 1 and 2 lvl 2 revives. Anyone else have better luck or are the drop rates really that bad. Makes me wish I could go back to being collected.

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Opened about 90-100 crystals and got only 3 revives.