I'm currently on a streak of 16 failures. So I thought I'd drop by the forums and share the math. Given the 20% chance to RE something: the probability of actually succeeding at least 1 RE in a streak is 1-(4/5)^x. (if you are doing a 10% chance use 1-(9/10)^x, but we'll be using the more common 20%)
Given 5 tries (x=5) the the chance of succeeding one RE in a streak is 1-(1024/3125)=0.67232 or 67.232%
lets continue with some math now for longer streaks:
x=6;1 - ((4 / 5)^6) = 0.737856
x=7;1 - ((4 / 5)^7) = 0.7902848
x=8;1 - ((4 / 5)^8) = 0.83222784
x=9;1 - ((4 / 5)^9) = 0.865782272
x=10;1 - ((4 / 5)^10) = 0.892625818
x=12;1 - ((4 / 5)^12) = 0.931280523
x=15;1 - ((4 / 5)^15) = 0.964815628
x=20;1 - ((4 / 5)^20) = 0.988470785
x=30;1 - ((4 / 5)^30) = 0.99876206
But consider everyone that plays SWTOR as a population(number of created characters is more then likely high enough to warrant this), these chances are the same for everyone so still if everyone is crafting 6.89% of players will in theory be getting a streak of 12 before they they see results, and 6.89% out of all the players is still a large number. Also statistics states something is not an uncommon occurrence until it falls into the -/+5 percentile. So missing 13 RE's shouldn't strike you are odd, but once you are hitting 14+ there is probably something wrong.
So at this point I've RE'd a few more times and failed continuously , So I'm asking Bioware, is there something preventing me from getting "critical" or "overkill" just because I have "redoubt"?