check from NYP if you are ok with a little extra fare ...it will fall under general quota and you will have more changes to get a confirmed seat..
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below is the current status at present from NYP-SC
12603 MAS-HYB
Sleeper...
more... GNWL25/WL8
3AC GNWL39/WL24
2AC GNWL23/WL10
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12759 Charminar
Sleeper RAC 112/RAC 109
3AC GNWL31/WL11
2AC RAC 14/RAC 14
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If time is not a constraint, go for Sleeper/2AC in Charminar and your ticket will get confirmed...If time is a constraint then book in 12603 Sleeper and it will mostly confirm and in the worst case, will get a seat.