I think that article you referenced to is almost accurate. It doesn't account for unique shallow tanks like the 45F/60F. There isn't much contact or travel through the water before the co2 hits the surface and escapes. So I believe a slightly higher BPS rate should be observed to compensate for that. I could be wrong. That's how I look at it, however. I'd stay around 3 BPS at least or more (for now).
Did you use 4dkh reference solution in the drop checker?
As for shrimp, I'd go with an easier more hardier species such as the red cherry shrimp, neocardina (or "neos"). But get the painted fire red grade. There's also pumpkin, yellow, and red rili to consider. Just don't mix these species because neos can breed between color variations and produce ugly offspring.