You shouldn't touch any of your mixes (or add any flavor) for at least a week. Some of them may be overflavored.
The mixes you are describing require some steeping time. Even commercial juices are steeped, without time, they would be flavorless too. If you get a "one shot" concentrate, some of that can be vaped immediately.
I wouldn't obsess on your mixes right now, it will drive you batty. You need to WAIT. Also, I don't think anyone said DIY is EASY. I find it fun, laborious, and worth my time. But I started very slowly and really learned to understand my flavors. I would mix single flavors, steep them, and combine in my tank to a) understand my flavors and b) get a sense of how they might interact. I don't follow recipes I create my own, but that took time and planning, and experimentation. It is a process, much like learning to cook.
As to instability and depression and anxiety yes it happens when you quit. Tobacco (not nicotine) contains MAOI-A and -B, even tar is an MAOI-B. These are powerful anti depressant and anti anxiety medications that happen to be in tobacco. As your brain recalibrates, it can be normal to feel these things. You could try whole tobacco alkaloid e-liquid, the best budget maker I know of is Umbavapes. You really only need a tiny amount (I would put like a half-dropperful in my tanks, starting out, I just mixed it right in and I still keep some around for stressful situations.) This may help your brain as it adjusts to the changes going on and it takes time to reach homeostasis, where your brain receptors are no longer "craving" those substances. WTA really helps some folks quit and is much easier to taper than regular cigarettes.
If you smoke a frustration cigarette here and there, you may find some relief, but in my opinion WTA is safer than that. Your other alternative is to consult your doctor regarding the anxiety and depression you are feeling. Some folks start smoking BEFORE the onset of depression and/or anxiety, and have a harder time switching as smoking was "treating" the underlying condition.
Best of luck, don't throw in the towel quite yet..
Anna