Etudica
Inspired
That's probably because a soft resets also resets Master Volume.
This. In my experience this was the only parameter that caused a drop in volume. Most of my recto patches have MV set to between 3-3.5, and after updating the amps a drop to the default value of 2.5 was fairly obvious.
I haven't experimented with the MV much in my presets for quite some time, probably around Q2 era. It was actually beneficial to reset amps in all my patches after Q7 bc I've found I prefer slightly lower MV values now with the recent modeling improvements. It's amazing how a difference of just -1.00 brought my DT Awake presets to life again!