Greetings mechanical gurus!

I'm building up an 8 speed bike right now and am considering going Shimergo and using Campy shifters but I've read on Lennard Zinn's blog that SRAM doubletap shifters pull the same amount of cable as Campy 10s...

Has anyone out there tried SRAM 10 speed shifters with a shimano 8 speed rear derailleur and cassette?...

Would I be better off using a SRAM front derailleur with SRAM shifters (or a campy front derailleur with campy shifters) or will I be fine using a Shimano front derailleur?...

Where do the extra two clicks end up?....are they on the inside or outside of the cassette?

Also, I have a choice of using two different rear derailleurs: a 9 speed short cage 105 or an early 90's era short cage 105 with a far stronger spring...which one would yield better results with a campy or SRAM shifter?

Thanks in advance for your insight!...