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I would just add either one copy or two copies of Splash onto him, that will bring quite a bit of white onto him. He also has minimal WF so that will reduce how much white he shows too (I think!).

This filly is Homz for Splash, and Medium WF. She is almost entirely white:

III Snow Storm i8

This mare is Het for Splash, and also Medium WF:

II Miss Vu

It won't give you the white you're after. Splash and Splash 2 are two completely different genes.

This is Splash 2 (PAX3) from the Genetics Guide: Minimal white compared to the Splash gene (SpsSps).
http://www.huntandjump.com/geneticsguide/?page_id=74

This is Splash (MITF): Much more white
http://www.huntandjump.com/geneticsguide/?page_id=77

As I said, Minimal WF will reduce the white shown on the horse. Sabino 1 does not affect the white at all, it is his White Factor.

This horse has Sabino 1 and Splash 2, plus Minimal White Factor:

EE Shower 487155

This one does not have Sabino 1, but has Splash 2 and Minimal White Factor:

3 White Well

If you really want more white on him, but don't mind which genes, add Llp onto him (Leopard) and then Het or Homz for ECA3P PATN1.

ECA3P controls the size/whiteness of the Appaloosa blanket through either + or PATN1.

This is what he would look like (both have Minimal WF):

If he was ECA3P+ ECA3P PATN1

Starlight Globe 4B

ECA3P PATN1 ECA3P PATN1:

RS Sneeuwvlok

w20 doesn't add any white either @StarfireAcres? I would leave him with Kit M and Sb1...


Caviar Dream

Only the horses with Splash (Not Splash 2) display white with w20, but that is the Splash adding the white, not the w20.. And the same with kit M and w20 - it is the kit M adding the white.

Before he only had a few specks of white now he has white all over and he was w20 before and when I added the sabino1 the white went away so I turned him back to w20

Think of W20 as a "white booster". W20 is a modifier genes so, without a pattern to work on, or with a pattern they cannot significantly modify like roan, W20 may be silent or very minimally expressed - phenotype would be a horse with minimal or no white at all. However, with a pattern W20 can modify, such as a white spotting mutation or tobiano or sabino or splash, W20 can significantly change that pattern and make the amount of white extensive.

W20 is kind of like the opposite of frame, which is also a modifier. Frame modifies white spotting mutations and splash by limiting the amount of white present at the top and edges of the horse, thus creating the "framed" look.