The question is should I have my millworker switch out the hardware of the drawers that he put in (some Chinese brand). Especially for 34 inch wide, 21 inch deep, 12 inch high drawers. After asking around on Reddit, a couple of pro cabinet makers mentioned that they won't warranty drawers that wide, and one said they don't work well over time even with the best hardware. They are already built. Should I switch out to Blum hardware for extra weight and add the synchro bar? Other issues are conveyed below, but these large drawers are my main concern. I would have done drawers not as wide had I known they don't hold up over time. I appreciate any feedback.

Here are the details: My millworker made frameless cabinet boxes and drawer boxes. The drawer faces and cabinet doors have been ordered. I did not specify the brand, but I specified soft-close, full extension, undermount hardware. On some of the drawers, the undermount slides he used have too much resistance for me when pulling them out and I have already paid him to change out 5 of the smaller drawers with Blum undermount hardware. They work much better; huge difference. To be clear, I am pulling on the drawer boxes without the drawer faces and pulls installed, but I know they are too hard for me. I don't understand is why some of the drawer hardware he used has too much resistance, and others pull out okay. My concerns were dismissed, so I paid to switch the problem ones for Blum instead of having him adjust, but maybe adjustment is all that is needed. There are still several smaller drawers that I can't confortably pull out (this is before drawer faces and pulls). I hear I can disable one side of the soft-close hardware, but not sure I like that solution. Strangely, the larger drawers that haven't been changed out to Blum pull out pretty okay; he used the same exact ones as the smaller drawers. Now, I am hearing that wide drawers have issues.