It is ok to miss 20 times in a row with unweighted dices. Because each throw of the dice is a 50:50 and bad rows happen. It would be suspicious to have other than about 50:50 rolls after 10.000 trials or so. Playing without Karmic Dice, like I do, increases your chances to miss or hit in rows considerably. Of course I have the feeling that I miss much more often than I hit and that I critically miss too often. It's a feeling till there are proofs by big numbers of throws that something is wrong.