no, 20% aren't really 20%^^
actually the chance is MUCH lower ...unfortunately
Do you have definitive proof of this? And don't say, "I went 30+ without a schematic," because while you may have gone 30+ without one there was a player who got one on the first try. You MUST take into account every player who has ever performed an RE before making such a claim. Only BioWare has those numbers.