Quoted from abagwell:

Starting to pick up some mods for my GB Pro, what would you guys recommend for the captive balls? I'm pretty sure I'm going with the standard green on the left and pink in the center, but what balls specifically would you recommend? Fluorescent or glow in the dark? Any specific manufacturer? Some of the pages I've been looking at are fairly confusing as far as what they selling. For example:
https://mezelmods.com/collections/ghostbusters-pinball-mods/products/ghostbusters-pinball-slimer-pinballs?variant=16895844484
That is listed as a set of 4 slimer green captive balls, but the color choices are blue and pink. Does that mean that you also get a set of blue or pink ones for the center captive balls or is it just a site error?

Quoted from SilverballNut:

For the PKZ shot, if you haven't modified the stand up under the ramp, then do so. You can buy a shorter standoff and replace it, then the ramp works SO much better. It becomes a fair shot (still hard, but doesn't bounce around and come out).

Quoted from abagwell:

The only real bug I notice on my pro is that the game doesn't announce on the display how many balls are locked like it does on the Prem/LE, I feel like it doesn't give non pinheads a clear indicator that they are working towards a multiball especially since the ramp just says "Storage Facility" rather than "Lock" like most games.