Newly Backcombed and Waxed Dreads opinions.
I do not recommend using wax and then cutting off the semi hard sections down the road. Cutting a dread will cause it to blunt at the end instead of having loose wisps. Those wisps are the drip lines to our locks which allow the water to drip off & out of the dread. Blunted tips are round, flat, fat, etc and have no drip lines, they take so many more hours to dry when mature can take over 24 hours. This can cause mold inside the dread if it is wet when sleeping or wearing a hat/tam. Drip lines help.....
Unlike most people on this website, I'm going to tell you that wax is OK, just only use a little and only one or two applications ever. If you use to much and/or apply more than a few times, you will see slow progress in maturing as well as nasty dry wax residue in your hair. Wax is fine when starting just to keep them together. Just by washing regularly it will mostly get out, but they will still be semi hard on the inside of the dread, that wont go away until you trim those parts off. Now when it comes to backcombing, your fine, it was a good method just like twist and rip or neglect. Bad news, I see your sectioning is a grid pattern which is bad, it needs to be an offset grid pattern so the dreads fall into the right place next to each other, not on each other. The bad sectioning is reason to comb them out and start over, everything else is all good.