What to do? What to do?

I'm knitting Wandering the Moor (a pattern based on Jane Eyre, how could I resist!), and using my digital scale and the shawl progress calculator on this blog I find that if I do two extra repeats, I will have 7% of my yarn left over. 3 extra repeats and I will have less than 1% of my yarn left over. Should I dare? Would it be insufferable hubris?