My bad. Sorry. So you are saying the SPX signal is in fact valid if you hit 90 the prior day as long as you dip below 50 and come back above 90 the following day? That differs a bit from what you originally described, you left out the 50 point.
No big deal, but I have found since you clued me in that it works 100% of the time if it is not invalidated the previous day.