The only time I ever tried GHS Pressurewounds was on my oddball headless-bodiless-fretless Westone Rail, I liked them better than D’Addario flats for my purposes, and it still has them. Because I liked them, I went on a GHS kick this summer, and I do also have a Yamaha 735A and 734A. I still have a set of medium GHS Boomers plus a .140 on the 5-string (tuned GCGCF) and love them; but the rest have been too inconsistent, with a high percentage of strings in the .095–.115 range sounding like flats (in a bad way) right out of the package ¯\_(ツ)_/¯ I might botch an installation here and there, but no way did I screw up this much in this short of a time, and as soon as I went to sets from other manufacturers (Stringjoy and Ernie Ball, for the record) I no longer had these issues. I wonder whether GHS has gone through a bit of a recent rough patch, as I’ve read of at least a few others in here running into very similar issues with their strings recently. They’ve made great strings since before I was born, and if they are having a rough patch I expect they will right the ship soon, but I won’t be finding out on my dime (or, more in line with the times, dozens of dollars).