Congratulations on your first La Scalas. Appreciate you sharing your findings. A recap of some so far are:
10AWG pure copper audio wire makes the K-77 sound better.
Silent Feet, aka "hockey pucks between carpet and La Scalas makes them sound better.
The K55V with new diaphragms and K77 tweeters sound better than the new A-55-G/2 drivers and SMAHL tweeters.
The most dramatic upgrades of these are 10 AWG pure copper speaker and terminal wire and an audiophile AC power cord.
You can hear the difference between 10AWG and 8AWG in crossovers.
Old caps rock, but not with home made spade connectors.
Wyvern banana plug adapters sound better, but only for a day.
Copper spade input connectors makes speakers sound better even when all the other connectors in the crossovers aren’t copper.
Let us know about your bare wire findings too.