Call your T/A and ask if the following cabins are available.
Cat 8A = 6463,6465,6467,6436,6438,6440
Cat 8B = 7427,7429,7431,7433,7424,7426,7428,7430
Cat 8C = 8435,8437,8439,7430,8432,8434
These are the rear facing balcony cabins on Triumph. There are also some corner 9A minisuites back there with massive wraparound balconies. By the way, choosing a cabin on this (and most) sailing is going to run a little more than taking their random balcony assignment called a BL guarantee.