There are many ways a shooter can flatten the trajectory of the arrow in the first 40 yrds, Lighther, shorter arrows and tips, higher draw weights, and atmospheric conditions.

I tuned and sighted my bow in the heat and humidity of an East coast summer, and then took my bow to the wyoming desert. It was amazing how much flatter my bow shot simply due to the lower amount of air restriction. I usually have a 20 yrd pin, a 35 yrd, and a 45 yrd. And use my judgement to fill the gaps. When i shot my bow in Wyoming my 20 yrd pin was dead on out to 40 yrds. Thats how i was able to put a arrow through the heart of an P&Y antelope at 45 yrds w/ ease