I had the same fear of diamonds and gradually overcame it.
I still cry when I rattle a ball but I'm working on that (on both the rattling and the crying lol).
So, you asked for thoughts -
1. Diamond's pockets are tighter, but they're also cut a little different, and that's good.
They are cut in a way that helps the ball find the hole once it passes the points and hits a facing.
The #1 trick to not rattling balls on a diamond: don't hit the rail on the way in. Like if you have a ball near the rail
(not necessarily right on it)... don't slop it in the way a lot of people subconsciously do.
Aim for the 'thin side' of the pocket and let it go off the facing and into the hole.
If you aim at the 'fat side' of the pocket and hit the rail, then the facing, it may rattle at higher speeds.
It's ok to hit the outer facing (blue line), avoid hitting the rail on the way in (red line).
2. Shoot softer. It has fast cloth and springy rails. You don't need to crush a ball.
Try not to leave yourself very straight so you can just roll balls in. This makes shotmaking easier
on any table but is especially true on diamonds.
3. The predator is not spinning balls out of the hole.
I dunno who told you that about Z2's or if you came up with it yourself, but it's a classic example
of pool players coming up with wacky equipment excuses. A ball that hits the facing will not stay up
due to some tiny difference in spin. If it stays up it's because you missed and needed to aim
closer to the heart of the pocket. Most shots are moving too fast for spin
to grab a facing and change the path in any way, and your Z2 is not wildly different from a 314.
4. Switching back and forth between shafts will hurt your game. Pick one and stick to it.
You will only kill yourself with doubt and excuses if you keep switching. I've seen it firsthand,
guys who shoot good but keep agonizing over which shaft to use. Every time they miss a ball they go
to the other shaft (instead of working on the REAL problem that caused them to miss).
Your game will only go up once you take away the shaft excuse and just stick to one until
it's part of your arm. It doesn't matter which one you choose, they both can put balls in the hole.
Just pick one, then sell, give away, or burn the other one.
Do not keep it in your bag
or you will be tempted to switch back and forth, and this will hold your game back by at least a ball.