Glad you like it :)
It's not quite like that. In 24 words it's difficult to explain... Let me try in the comments.
The skill only allows you to ignore negative dice - it doesn't grant you positive value. For instance, if you have a skill of 3, like you said, you can ignore 3 negative dice. But, you still need positive dice to succeed against an obstacle of 1 or 2. And that becomes harder with less dice.
It may not be the best solution... I'm open to suggestions. But I also wanted the dice to emulate HP or vitality - you become weaker as you lost.
What do you think?