I think some of the powder advice here conflicts with your apparent goal of producing loads with significantly reduced pressure and velocity. If you employ those slower powders for reduced loads, they never get "hot" enough to burn well, resulting in inefficient combustion and a lot of unburnt power blowing out the muzzle behind the bullet. In addition, the loads you've listed with the slower powders won't produce enough pressure to thoroughly expand the case on firing, often resulting in sooty cases and sometimes (rarely in US Krags) a bit of "blow by" as gas escapes back around the unexpanded case.

If you wish to produce reduced loads, you're actually better off with faster powders (like 4198) that will burn more completely at the lower chamber pressures desired.

In my next post is a QuickLOAD software estimate of results with several powders at a pressure of 30000 psi (about the minimum for good case expansion in a cartridge of this size). Note the "Prop.Burnt" column to get a reasonable idea of load efficiency.

As for the vertical POI problem, I suspect you're going to need a higher front sight blade. If you're handy with tools, this is a pretty simple do-it-yourself project that can be accomplished without any permanent alteration.