From what I can tell, you're grind is rather coarse for a pour-over. You should have a grind the size of kosher salt for most drippers. Perhaps its personal taste, and I cannot argue that. However, it's typically recommended you start with this grind size and adjust to your preference. As far as my own experience both working as a barista for a few years, and being a over all enthusiast, most grinders don't provide consistent grinds at a coarser settings.
People are right in saying that most home appliance grinders won't produce very consistent grinds. This is partially true. Your typical consumer grade grinder uses a conical burr, and conical burrs work great for finer grinds. I've had 3 different conical grinders, and I've used commercial conical grinders in the past. They all seem to produce fairly inconsistent grinds for coarser settings. However, they work great in espresso machines, which are generally grinding to a very fine grind. When using flat burr grinders I notice a much better consistency in grind at coarser settings. Many will say that the larger the burr and the slower the grind the better consistency you will have. However, I've never experimented with this myself, but I will say that flat burr grinders produce much better coarser grinds than conical burrs.
An example of a flat burr grinder is one that you would see at a grocery store or a coffee shop. They are generally very expensive, as they're generally fairly large and aimed at commercial use. That said the Baratza Virtuoso is a conical burr grinder, and it's probably good at what just about any conical burr grinder is good at, medium to fine grinds. I will say that one drawback with flat burr grinders is that they're very slow and create massive amounts of heat on fine grinds(espresso/turkish).
I'd say a conical burr is good for anything near the coarseness of salt and finer, anything beyond that would be best ground in a flat burr grinder. As far as a flat burr grinder, I feel its the size that matters. You'll want a larger disc for more consistency. Its my assumption that with a larger disc a slower speed will grind the coffee slower and more evenly, causing less of the grounds to crack and mash into finer particles while grinding.
Most of this is based off of my own observations, there are a few forums which concur with this, but in general there's not much else to support these claims. Maybe the flat burr grinders I used were simply higher quality than most of the conical burr grinders I've used.
My recommendation would be to try a finer grind and see if you get better consistency then.
As far as a blade grinder goes, I'd say absolutely not. I doubt that a blade grinder would ever be more consistent than what you currently have. You can use a blade grinder 100 times and never come out with the same grind size, where as with a cheap burr grinder you'll alway have the same grind even if its not consistent. Even as far as consistency goes, a blade grinder won't achieve this either. I might(maybe..) recommend a blade grinder if you had an auto-dripper, where it wouldn't matter so much.
Try a finer grind, and let me know if the consistency gets any better.