I know I am in the minority here, and I readily admit I may have just had a bad experience... but the one Deva cut I had was a disaster for this exact reason. My hair was so uneven and ridiculous, because as you said it lays a little different each day. Wet cutting isn't perfect, but at least there is some order to it. I actually had to go have it recut wet after the deva cut, because I couldn't walk around with it that way! Please note I researched carefully and chose a deva certified stylist that was highly rated on this site.
My hair: 3b, corkicelli, medium porosity, medium texture, medium/thick density
Co-wash: DevaCurl NoPoo
Rinse-out: GVP Conditioning Balm
Leave-in: KCKT, Suave Naturals Coconut, or my rinse-out!
Gel: SS FHG (my new HG!!)... I also like HESMU, AIF, CJ CQ, BRHG, CJ PP and the occasional LALSG
CG and loving it!