Way 1: using yr best yellow gems to socket on yr helm.
Way 2: Equipped all MF items, skipped all other properties.

yes, there is. i heard is + by 75%. but is still very minimal.

if a legendary item drop is 0.5%, even u got like 200% (or more) MF also like 2% of possibility.

If not mistaken, the legendary drop is like super rare, only blizzard know the odds.

Is better to pile up yr gold first, buy from AH.

leave the MF for the last.