I think that you were just unlucky. I used this deck (the PSNbow with six SoBr) to grind for over 5000 games and, although I didn't record data for those games, the change in my W/L stats showed a winrate of around 47%, consistent with the sample that I did record data for. Also, you said that you had 9 out of 22 games where you didn't get the combo, which is all of the non-skip losses. In my data of 162 games, out of the 67 non-skip losses only 35 of them were from not being able to play the combo, including not having SNs or pendulums.