what gap do u guys use?

im reading and it says .28 to .32
however, when im at .29... the engine idles rough and dies once in while
while idling and on drive
im trying it at .30 now... so far its better but its still kinda rough... died only
once while in traffic and on drive ( didnt bother trying it again)
will opening it up to .31 or .32 be better?

thanks!
(m20 525i)