bard lull
 

does using a stringed instrument help with bard lull at all? in the form of resists, better lull radius, etc?

I think it just increases the duration.

It makes the radius smaller, that's it I believe.

None of the above. Some time ago, it was actually making the radius larger, so that got snipped. Will have to prove otherwise to get changes.

I seem to have way less resist when my lute is on. then again that lute has like 15cha

I'm pretty sure the lute wouldn't affect resist rates since there's no resist mod to the spell (it's not like the chants where using a drum will modify the amount their resists go down by). Also correct me if I'm wrong but I thought that cha only affected your chance of getting a critical resist, not resists in general.