Well, everyone has an opinion, but I've found that there are some bows that just seem to like an arrow that the charts(and other guys) say won't work!
I've used a lot of CEs and I'd say you're in between the 150 and 250. But, they're right- a bare shaft test will tell you a lot. But, you need to start with a long arrow of each spine and cut them down as necessary. BTW, 4 fletches at 90 degrees do nothing for you, IMO. And 195 grains isn't enough to weaken a 350 shaft to fit your needs.
Then again, your own posts say a lot. You're on a pie plate at 20 yards, you typically don't shoot past 15, and the fletched 350s fly "amazing" and are quiet. Hey, you could do a lot worse!