Ok I reprogrammed it so that instead of changing your velocity all together it just adds velocity in the opposite direction from the shot. This produces a smother effect that also works relatively in that you will speed up if you are running away and shot in the back. Also if you jump up and are shot from under you will fly up higher.

I can increase how often the knock back triggers and how effective it is so let me know if it needs more adjustments. Also I can adjust it per race if needed although I do not think it is high enough for that to matter. Note that HS knock back works like before and activates 100% of the time with an amount different for each race.