Use the use spacers of your choice to get the correct height of the tail piece allowing a nice break angle of the strings not touching the back of the bridge and screw the whole thing down making a nice tight fit of the tail piece. The middle ones are perfect on my Corsa modded Les Paul.
If the original BBpros have been changed for high end boutique PAF PUs (Wizz, OX4, Throbacks...) the value might increase (second hand BBpros can easily be found at very reasonable prices.)
Same if the stock harness has been changed for a better one with quality pots & caps. YMMV.
2) I have a Corsa mod Les Paul Standard Faded LCPG (# 282 you guessed it) with the neck PU magnet flipped and 2 Les Pauls with the JP wiring and I personally can't hear a difference between OOP with magnet flip or with JP wiring. YMMV.
3) It's the sound I get with JP wiring when both tone pots...
Indeed they are capacitors, not resistors.
On my #1 they are Luxe PIO Bumblebee, capacitors set 1956-1960 "Woman Tone", 0.015uf 400 VDC for the neck and 0.022uf 400 VDC for the bridge.
On my other LP they are Russian K40Y-9 & K40P-2 military PIO capacitors, also 0.015uf 400 VDC for the neck and...