Based on how your rifle is throated and whether its an original military barrel or a custom, it may not shoot the shorter bullets very well. ~130's should shoot fine - you might have to seat them out a bit to approach the lands, but they will be relatively flat shooting in the Swede.
Anything in the 140's range should shoot very well. IMR 4350 is a classic powder for the Swede but your choice of RL22 should work too. No experience with RL19 in the Swede but it sounds like it works well too. For predator hunting purposes, unless you live in extremely wide open country, I wouldn't waste time shooting the long ELD type bullets in the Swede.
The 6.5x55 Swede is a classic cartridge that just keeps on doing good things.