For the Mosin target, what position were you shooting, and what were you aiming at?
It is possible the front sight needs to be adjusted to the left a hair.
The elevation thing is another matter, I always use a 6:00 hold with iron sights at bullseye targets (aim at the bottom of the black circle).
It is possible you need either a taller front sight, or remove a little bit of material off the bottom of the rear sight slider, to let it sit a little lower.
But based on those targets, I would use the AK, assuming you can find a 5 round magazine.