I'm pleased to hear that you are satisfied with your thicker CX reed plates a lot of CX players will agree.
Vern has already given you an in-depth help how to overcome your buzzing G-blow. So, I only would like to add some of my experiences with this second largest chrom problem next to sticking slides.
Last week a visited the Frankfurter Music Fair and talked with Hohner also about the numerous problems with the CX 12 windsavers. Yep, they have realized this too but to do something against are two different pairs of shoes.
In most cases the outerplaced windsavers of the innerplaced blow reeds are buzzing. You can see this by using a razor mirror when playing the reed in question. The buzzing is caused when the two plys stick together, no question. If you have ascertained such a real 'miscreant', you can do as Vern has adviced. Additionally, you can do some searching why just this blow buzzes and not another. To find the reasons is always adviceable, instead of sending the harp back to the factory for repairing which is a rather unreasonable measure.
A curled windsaver is the main reason but also straight ones can buzz. When you compare the windsavers, you will notice that the shorter clear plys are not proportional shorter to the white plys. There are some plastic plys which have almost the same length as the white paper plys.
In such cases the consequences are obvious. The wet paper ply sticks in almost its whole length to the plastic ply resulting a fine buzzing unit. I simply took a little scissors and cut off so much of the plastic ply until the adhesion was somewhat below its 'rebending force'.
Vern said it just the other way round:
>Don't be alarmed if the clear ply doesn't touch the >white ply along its whole length.<
Absolutely, it's even worse.
These paper tigers are in fact a real weak spot of chroms and demand a very cautious handling to adjust or replace them.
A lot more could be said but John Frazer has already a full-time job to study long windednesses that I forget the rest.