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I think it’s to do with w20 being a booster. I’m noticing the high white marked horses have combinations. I think if it’s by itself it just puts on low level ‘normal’ markings, but with anything else it tends to go crazy. Also I think the other patterns express at different levels, the w1(or is was it w2?) on Daisy is a high white marking pattern, so even at low WF it covers most of the horse.

Of course I could be barking up the wrong tree entirely. It’s been a while since I played and I’m not well versed on how the Kit stuff all interacts or behaves.

Over on the other server, I wound up with a set of three mares with nearly identical genetics, but three different white factors. It's easier to see the impact of the White Factor as their other white-producing genes are the same.

https://hj2.huntandjump.com/forum/discussion/67480/nice-example-of-white-factor#Item_1

I believe that White Factor works primarily with the Kit and Splash mutations. It generally appears to have no impact on appaloosa markings.

White Factor as a gene is independent of a horse's white markings; it is not itself a considered a pattern gene but it has a lot of control over how loud any existing patterns will be. WHITE (1-11 or whatever we're up to) are KIT pattern genes, along with the various splashes, sabinos, tobiano, leopard complex, frame, and roan. For a more in-depth answer and important lethality information, take a look at this link: https://www.huntandjump.com/forum/discussion/16745/new-kit-lethality-and-kit-mutation-load-explained For a quicker visual explanation, consider:



This horse is plain black with zero white factor. No visible white markings at all. Whereas,



this horse is also a plain black but has Extensive white factor, thus displays visible white markings in spite of having no pattern genes.

White Factor continues beyond that point to interact with ANY pattern gene a horse might have. For example:



This horse is a black tobiano with no white factor and very minimal (but still visible) white markings, whereas,



this one is a black tobi with extensive White Factor and so has more white than black showing.

The more pattern genes you stack on a horse, the more white it will have regardless of how much White Factor is involved:



This one is a White Spotted Black Splash Tobiano Frame Appaloosa with a White Factor of None, whereas



is White Spotted Black Splash Tobiano Appaloosa with Extensive White Factor.