Weakest link? Would be easy to say "Kimber".
But, not so fast! My view on the weakest link is you examine every aspect of the system. Not just the major components. Then you study your options. Then you look at what can be done to get the most improvement for the least cost.
If everything is not on something at least as good a Nobsound springs then that is your weakest link. If you want to do better, which at your level you should, then Townshend Podiums under the speakers, Pods everywhere else. Huge improvement. Bigger than any component upgrade.
I would also look at Synergistic PHT on the cart, HFT on the speakers. Purple fuse in the Herron.
I've done all this stuff, even have the same Herron, and know whereof I speak. Some of this stuff like the fuse you will get so much benefit from so little cost you will not believe. Podiums cost a lot but the improvement is totally in line with what you get. Search around you will see.