Replacing 650 spring with 700

I have the older Walker Evans coil overs with #650 All-Pro springs that i bought used here with unknown miles but the springs are a bit saggy i think and i have to do a lot of pre-load to get my height (V8). Its starting to feel like im limiting a bit of my travel because my height im at now.I have thought about buying some King springs #700 weight and that would allow me to have less pre-load for the desired height correct?

Basically im trying to still use the same coilovers and get the same height but less pre-load and less limiting my travel. Would buying a #700 spring do the trick? I also dont want to butcher my ride quality because its pretty nice just on random deep bumps i can feel it slightly limit.

Pic for pre-load

 

yes.