For 2C CH
Technically, 2C CH - 6A - j.2C is just as good as 2CH j.c j.2c
6A does 20 more damage, and is slightly more stable (more time to dash 2b) at the cost of less corner carry compared to j.c
Ideally though, 2C CH -> 5C (2C) 6C is the way to go, generally the 2C is omitted unless you hit them point blank close to the ground, but for most cases 5C 6C is more stable.
kind of hard to descibe the ideal spacing for 5C to 6C, but generally, you want the 6C to hit them as close to you as possible and as high as possible.