The safest time to go to a place is after an attack. I would not worry about it has the attacks were in Kuta AGAIN and another area near Kuta I am not fmiliar with.
However I never let these things get in the way of my travel.
I just returned after 4 months in Indonesia including a month in Bali. I feel so bad for the Balanese as tourism was just starting to pick up and they were thinking that by next season things would be almost back to normal. Heck not now.