That all looks fine IMO
2 rounds to load a bow and 1 to fire makes sense, although that is very fast. 4 seconds to load (retrieving the arrow and notching it) is world record speeds. I average around 8 seconds with a longbow. But 2 seconds to shoot is fairly average.
Loading a crossbow is a 3 step process: 1- drawing the string to the nut; 2- retrieving the bold from the case; 3- placing the bold in the track.
Last two steps can take two seconds each, but the first step depends on the crossbow. A light crossbow can be done in 2 seconds, while a heavy crossbow can easily take upwards of 10 seconds.
Either case, they can be fire in 2 seconds.
Since Harp isn't suppose to be hyper realistic, 2 rounds loading & 1 round firing for bows is fine. I remember seeing some loading times in the books but I can't remember what they are exactly. My thought is still that those times worked fine.