Hey there! I use and like the SM Coconut/Hibiscus line, BUT it doesn't have hydrolized protein in it. (It basically means that the silk protein in the SM line is not as effective).
From what you describe, yes your hair probably needs more protein and you should probably add in at least an RO w/ hydrolized protein in order to maintain your protein levels in between PTs. Hope this helps!
EDIT: you can also get Colorful Neutral Protein Filler from Sally's and add a few drops to the SM conditioners you already have.
F - N/LP - NE - MD -- 2B/C
Tropical climate/high dews routine:
Low-poo: BROO IPA, YTCukes, Original Sprout Natural Shampoo*
RO: G SaS*, SSI Okra*, MillCreek Biotin, EO Keratin
LI: G SaS* or SSI O* or none
Styler: FSG* or Volumax Mega
DT: EVCO (rare)
PT: iagirl's gelatin*, SS PT*
Experimenting with: Ouidad CC gel
* = I love it!
Silicone/Sulfate free since 2010.
iherb discount code: CFN646