Hi Posca,
I've been using Fib Analysis in conjunction with volume spread analysis and harmonic analysis, and the 78.6% would definitely be the next "key" level - it is used for quite a few harmonic trade set ups.
I also find that the 70.7 level will reveal key areas of support and resistance when trading on Fibs alone (the complementary derived ratio from the square root of the 50% Fib level). Try adding the 0.707 level to your Fib settings and you will see what I mean.
Hope the information helps,
Peter