That sounds like an interesting experiment you have planned with dual grit testing for knife sharpening. It's good to approach it with an open mind and acknowledge that results can vary for different individuals and techniques.
Using a guided knife sharpening system is a smart choice for consistency. Sharpening one side with a 250 grit and the other side with a 1000 grit should give you a good basis for comparison. Working towards the blade instead of away from it is also a valid approach.
The theory proposed by some was opposite of what I did ..
They sharpened away from the knife to ( supposedly ) draw out the bur / serrations ..
There has been an argument for and against sharpening into the blade ( and the other way around ) ...
But I think ( there fore I am ) , that it makes little difference .. Do what makes you happy ( live long and prosper ) .
Yada yada yada .
So I did this experiment as near the opposite of the prevailing theory as possible .. ( Homeslice )
As for the method and technique ? Im not sure it matters ....... What I think matters is that a dual grit edge is laid down .. How the dual grit ends up on the knife ? Does it matter ?
Of course , a bad edge will always be a bad edge and a good edge will be a good edge . ( Hence the guided method ) Removes a lot of iffs and butts ..
The important thing is the gains ...
And right now I am running a grit experiment , where I started with a polished edge that had been reground first ..
Bling VS the rest ...
https://www.bladeforums.com/threads/polished-edge-vs-the-rest.1934816/
Yes it's a budget 440 blade , but I am loosing less rope .. COs I cant buy any at the moment ( ATM ) .. Yeah , apparently Oz has dried up on 50 meter lengths ..
Can't find it .. I can buy 10 meters , but it's the same money = RIP ...
And these experiments are eating rope . ( Which ATM I can't replace or afford to replace @ +500% )