Yea most likely a male. usually some cichlids do get humps even if they are female but it takes a old girl to get one. as far as the age old question on improving hummp size. on a fish where its not usual to have a huuuuuge hump like midas flowerhorn ect u really arent gonna be able to improve it or get it muuuch bigger. High protein diets do help. i feed as a staple a 50% protein pellet as well as some other things and i will tell you i do see an improvement on humps on fish my 3" green terror , 3" jewel and female midas all have good size humps. most fish genetics also play a huge roll.
I would add that i love that convictx hrp . i have a blue female that breeds with my platinum honduran red point ive never raised the babies out to see what they would like...now im curious.