There are a lot of variables, from your lifestyle to weather conditions to hair properties. The Devachan salons may well have a controlled environment, air conditioning maintaining a fixed temperature and humidity level. It probably helps having someone style you that can see 360 degrees of your head. Have you seen the before and after threads?
Post your before & After CG pics
Before/After for Wavies
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.