on-strike enchant question

[Peytin of Rothmire]

What is the difference when creating on on-strike weapon between "on touch" and "on-target"? I enchanted an ebony sword with absorb health and invisible on self as on-strike, but I don't remember if I chose the on touch or on target option. At the time I figured it wouldn't matter because it was an on-stike weapon. I'm noticing the absorb health has worked with pretty much every hit. The invisibility hasn't worked once. Should I have set one of these a certain way or is it something else? I don't have any resist magicka or anything like that that I've been able to find on my character.

[Kakero]

cast on strike - When the weapon strikes the opponent the spell will be casted

cast on touch - You need to be a touching distance from your opponent. Need to use hand to cast the spell.

cast on target - You need to be far away from your opponent. Need to use hand also.

Invisible works only when you stand still or walk or do nothing, but if you talk, open a chest, attack something or being attacked, the spell will be broken. Try play in a 3rd person view. go attack something. when you strike the first blow immediately stop and stand still and see if you are invisible.