One thing that I didn't see mentioned yet is the effect of the filter papers. Different brands of paper have different resistance to flow. Even if you go with hario brand, they have different factories that make work differently (though I dont remember which is faster). Basically just pay attention to what you buy, and if it's working for you, stick with it. I like bleached papers cause they have no taste, but I still rinse them before putting coffee in just to get the filter to stick to the funnel properly.
I don't know if you got a plastic or ceramic version of the v60, but if it's ceramic, you'll definitely want to preheat it, otherwise your brew temperature will be cooler.