On my single bike with a double I always put the chain on the smallest front ring and smallest rear cog, 39/12, and take enough off so the upper pulley doesn't contact the chain.
With the triple on my Santana if I put it in the 30/12 , and yes I know not to use this combo, I could add a little more length to the what came from Santana.
What is YOUR method?
I think a little more length wouldn't hurt as long as there isn't any rubbing of the upper pulley or am I wrong.
First bike with a triple.