I would consider myself in the "I can hear just good enough with a HA" section. I reckon I am spot on the hear 80% with HA's.
My hearing loss is about 60/75db in both ears. With my HA's in I can get by in most situations, and in really noisy situations I do better than hearies as i can lipread....its only when they try and help me and shout in my ear over the noise that I then have a problem!!!
....but I don't want to just "get by". I want to hear as well as I possibly can. So if CI can give me better sound, better clarity and a better comprehension of the what is going on in the world around me, then I think I should consider it.
It is not just about me either....my wife and kids have to deal with the fact that I mishear stuff on a daily basis which makes having conversations irritating....I have two teenagers....its hard enough getting conversation out them sometimes anyway without mishearing what they said when they did say something!!
Just my opinion
If you truly hear 80 percent with ha's, and get by with ha's you should exhaust all the avenues with ha's. 80% natural hearing is better than you will likely obtain with an CI. A Ci is different hearing than natural, less rich and much less input than natural.
A CI is not a cure, and a device of last resort, please do your research, wish you all the best.