*SIGHS*
YA... I've recently gone back trying for my second heartwood saw... going on two weeks and still making footstools. However, I did get a couple nice talismans that I sold.
And yeah, high luck does help, both the quality of the items in the reward pack and the number of items in the pack. It does not improve the percentage of the runic saw drops, but because you are getting on average more items per reward, you have a better chance at a runic.
STILL, I wish oh I wish they would put the drops back the way they were originally in Heartwood.