OK, so what do you know about your rubber brake line connections? Hopefully not original at this point!
I can tell you, insuring the flexible hoses are in good shape does make a difference in the over all performance.
I, for one, would not want to scrap a $300-400 brake booster without a bitter fight to the end. Perhaps, someone will way end with a known good setup to compare. Regardless the mfg., generally, all work the same.
I too am reluctant to throw away everything and start over, but it's not off the table. But what system comes with a guarantee? As best I can tell, the rubber hoses were installed in 2009. I hear that 6 years is the life of rubber parts, but it seems everyone goes longer. I plan to remove a front hose and check it for condition and blockages. If I find any indication of deterioration I will replace them all.
1966 Mustang 2+2, A code, AOD AT, PS, PDB, AC, Pony deluxe interior