CX Maxima 350's are what I switched into this year and I have nothing but great results.
DOR..I shot those same arrows as you do and I just didn't get consistant arrow flight. I didn't really spend the time figuring out if I had a bad batch or what the deal was. I wanted a change, so mainly why I'm shooting what I am now. Plus I really thought I needed a stiffer spine than what the 400's gave me.
As to the weight difference with the Maxima's...I was pretty impressed. Within a dozen, there wasn't more than a 1.5gr difference between the lot. For paper shooters it might be, for hunters..that's nothing.
Good Luck!