Yes I have tested my mods and yes the signal strength has improved and became more reliable. The modification was never about distance as I only fly line of sight, it was about signal reliability and that has improved.
Thanks for the info. Besides my DJI drones, I also fly FPV. On those drones, I use TBS Crossfire transmitters for the same reason. Although it will allow me to outfly my batteries, it's the solid, stable signal that I'm after.