But if you have 95% hit chance (so, that leaves 5% for a miss, and approximately 3% or 4% for a crit miss with jinxed), which is very possible even with 100bg skill (Really, onehexing doesn't require alot of skill points), then I don't see what you are complaining about. :/
Jinxed DOES NOT affect the amount of POSITIVE crits you get.
Also, I heard weapons can have a higher crit miss chance if your weapons are repaired several times/have terrible condition. Just get a friend create a character with Jinxed and do the neccesary tests.