Certainly SS quota cannot be applied.
Now as far as HO quota is concerned, as per my knowledge, you have to prove your urgency of travel before the concerned authority at the station (Before charting). Opt for HO only when you have certain proof.
Second thing is, looking at the predictions of various experienced members, it can be concluded that your ticket will CNF at the time of charting. So do not worry.
Hope...
more... for the best!! and prepare for journey.