Highly porous hair benefits from protein treatments, followed immediately by a deep treatment.
You could try Curl Junkie Repair me, which is a good protein treatment, and follow up with Curl Junkie Rehab (no, I don't work for the company LOL).
There are probably equally good drugstore versions - I just happen to like the CJ products a lot. I don't know about mayo - I do think it may make the shower very slippery so watch out if you use that.
A few protein/deep treatments will help a lot. Good luck and let us know how you are doing.
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