Search:

As I always say :
http://straightrazorpalace.com/shaving-straight-razor/112179-if-all-else-fails-read-instructions-aka-shaving-basics.html

I sold nearly all my razors to get the money to buy one & I still couldn't afford it ;)
You'll have to ask an owner. i just work on them.

Interesting post. I wonder if the Livi razor is the stiffest & heaviest of all your 4 ? That may account for it's ease of use for a beginner.

The other "juddery" razors may not be properly sharp...