Change your string loop. I change it whenever I see wear. Should I change it more often?

I would say you're changing it about right.

yep thats what i do, when it starts to were, then i change it, I think your doing it right.

I am always tinkering with mine in terms of length, location, etc.... so I would say quite often. However, if you are just referring to when it should be replaced in terms of maintenance then I would say whenever you see signs of wear and tear.

I don't think that it matters as long as you change them when first signs of wear appear, not any longer, I waited too long once and ended up with a fat lip and lost arrow.