Just finished up a few mods on my YJM strat.
Mod 1: No more cramped strat volume knob.
I can't stand the volume knob placement on strats, I always slam my hand into them. Put in a new guard with two knob slots for volume and tone. On YJM strats, the bridge Tone knob is a no load pot, so the Tone control on this new setup is a dual gang pot. Top one is a no-load tone pot for the bridge and the bottom is a standard tone pot for the neck. Works great.
Mod 2: Tighter saddle spacing.
The saddle spacing of the bridge that comes with the guitar is too wide for the neck. I installed a Fender bridge that has vintage body screw mount placement but modern saddle spacing. Fixes the string slip issue for the high half of the neck.
Mod 3: Lowered middle pickup and magnets.
The other major thing I can't stand about strats is how I always catch my pick on the middle pickup and its magnets. I hate it. So my tech lowered the pickup as far down as it would go and moved the magnets down as well with the help of a soldering iron to loosen them up. Now my pick never gets hung up on anything. Works great. Also before anybody says anything, this is a rock and metal guitar. Bridge and neck pickups only. The middle pickup still works but let's be honest it's for decoration only on this guitar, so this mod doesn't change a thing about any sounds I'll use.
Mod 4: new brass nut.
The stock string spacing at the nut is cut too wide. The high E was constantly slipping off at the low frets. Had my local tech cut a new brass nut with more narrow string spacing to resolve the issue. Now the high E no longer slips off the low half of the neck. I was afraid tighter string spacing at the nut would make chords feel cramped but the tech did a great job and low chords still feel fine.
This guitar is exactly how I want it now. It's amazing. It has everything I want out of a high gain SSS strat and nothing I don't.