All that I understand from what you are explaining seems to be fret leveling issue… But again I’m not sure to get everything ^^’
Did you change guauge ? Is your neck straight ?
Try to push harder on the string to see if it’s start to sound like a G (even if it’s sharp odd), if so it’s probably your 17th fret that is too low, or 18th too high.
It’s not a specific one for me…
I need to have 24 frets, with great access to the end of the neck, two humbuckers with split, fast and slim neck profile, a good floyd that stays in tune…
I got a Schecter Synyster Special, and it works great, but I got to change the Floyd, and I will replace the neck Invader with a Dimarzio Illuminator
And I hate to have knobs near my hand when I strum hard, like every stratocasters, knobs got to be far or behind the bridge… I’m not that demanding, right ? ^^