Have you tried doing a roller set instead? You can get nice waves.
I just worry about the chemicals in the Japanese straightening treatment. I understand how you feel though - I have given up on curly hair for the time being, although I will probably go back to it in warmer weather.
Good luck - I know for some people (me included) it's no picnic having curly hair.
2/c and some 3A. Modified CG.
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Protein treatment HG: Curl Junkie Repair Me
Conditioners: Curl Junkie Beauticurls Strengthening Conditioner,
Deep condish: Curl Junkie Curl Rehab
Stylers:Curl Junkie CCCC or CCCL
in combo with a gel, usually KCCC
Trying Curl Keeper - still experimenting
Every day is a gift