I don't have a "pro package" CZ. I have modified my CZ's with parts from both CZCustom, CGW, and stuff I design and build myself.
It depends on what you want to improve and what your intended use for the firearm.
Trigger bite can be solved with a trigger replacement. I personally like and use the original 85C profile trigger. But I started designing my own triggers to improve ergonomics.
The CGW pro package is just a convenient package with all the normal parts that get upgraded, assembled and proven to work together included. You can't go wrong with the pro package or the customer service offered by CGW. They are fantastic folks.
Cheers,
Toby