hi Peter - no worries, i have been on this journey, and hearing your system is on my list should i be blessed w trip East in coming year..you are always welcome to visit and listen my place.
sounds like you landed on fantastic speaker wires, congrats!!!!
i would also recommend visiting Vandy owners forum on Vandy website, there are 5 series owners there w many years experience and system evolution.
i had 5a for years in two different rooms, running them on factory spikes and shoes on hardwood floors. Wires initially the set i loaned you in a shotgun biwire configuration ( you now have a vastly better wire, which i am considering for my TreoCT ). IC are AQ Wild Blue. I used the 7 Filters on factory feet but mass loaded to floor. I use Vandertones, the meter RV suggests, but i also have RTA and calibrated mike to work my room RT60 ( nearly textbook control room target ) with natural room treatments, furnishings, etc...
on amplifiers : i have run them with as few as 75 wpc ( ARC Ref75), the Mac202, Ayre VXR- regular and twenty , i have heard them many times w other amplification from VTL, ARC, Aesthetix, ....yes the like tubes and well executed low negative feedback SS.
while i now run 7’s and the Vandy 7 amps, i believe the 5 series to be an amazing speaker. Richard is tireless at improving, the Quattro and up are lovely as well.
enjoy the music
jim