Sorry, finally read this on a computer instead of my phone and I realize now you had mentioned the light you are using in your first post. Atleast that's the excuse I'm using, lol! Plus the pic!
I don't have experience with that light but it looks to me like it will do the trick. They even give par values at 12" which are not too bad.
The kh is still a big range but really I don't think it matters that much. As I said I'm running a tank right now that has a kh of 107-125ppm and the shrimp are breeding and plants growing. The best thing, no matter what value you decide to keep the tank at, is to keep it steady.
Yeah, see you have a bunch of micro nutrient, specialized fertilizers/supplements. Nothing that accounts for the big 3 (nitrogen, potassium and phosphate). Since you have predominantly all root feeders you can probably get away with just root tabs. I know the swords will love it! And the dwarf hairgrass is going to need all the help it can get. Having just seen your photo I couldn't tell if the anubias were attached to the wood or not but if they are in the substrate make sure their rhizomes are above the substrate line or they will rot.
I think the fish that you mention will be fine, once the plants start growing (that's the key). It might even be beneficial to find a fast growing plant to soak up those nitrates. Something like hornwort, depending on where you live. You don't need to keep it in there forever. Just in the beginning to try and help any algae blooms while your swords recover.