Well, of course eggs and mayo (which is just eggs and oil, I guess) have a lot of protein, so if your hair feels better after that, I still question the protein over-load... But then again idk.

Maybe you just don't have the balance right? Maybe you need a lot more moisture along with the protein? Add more oils in, perhaps cut back the protein a little.

Just curious - have you tried the gelatin PT?
What about humectants? I add honey and EVOO to my RO, and I leave GVPCB in my hair a lot, too.

Your hair is quite intriguing!! Lol!!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.

Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing