We no longer use anything burn and done and they hop around like nothing ever happened.
I do L/R ice L/R ice... time is different with all the goats... Keep tip flush but rotate clockwise light pressure...
One goat may do ok with so many seconds yet another goat not.
practice on a board.
SHAVE the area... it is easier to see when you are getting a good burn and it won't smoke and smell like it does with hair! UGH
People talk about copper but that copper can be their and you haven't really burned deep enough. You do not want white.
Usually vets do get scurs more than other because they are doing them when people bring them in-which is usually to late.
The other factor is many vets won't do Nigerians... they look at them and are afraid they will kill them because they are so tiny. Vets that work with a lot of standards will often tell the client to use a Nigie breeder if they can.
It could be 5/5 5/5 or 5/5/ 8/8 or 8/8/ 8/8
A few vets I know do a 15 second burn

Of course that is on standards...
Um NO I won't do that and definitely not on a Nigie.