It seems that the perfect powder for you hasn't been made yet!
Bullseye, Titegroup, AA#2 and a whole lot of other good target type powders meter well and are consistent but none of them are particularly good at case fill!
Unique, SR4756, 800x and others either don't work well at that pressure or are hard to meter.
I have never used 700x but it may be better than most as it's a flake with a hole in it, not sure though. Maybe someone else will chime in here to give you a hand that has used it.
One thing for sure though, I have used some mighty good powders in all of those cartridges with good success. With the 40 thrown in there, for sure, one size isn't going to fit all.