I' m shooting about 295fps and I still shoot a 20-30-40-50 set-up.
If anything I set my 20 yard pin a tad low (maybe 1/2" ) It' s actually probably more like an exact 18-19 yard pin.
That and the fact that I shoot small tourney sized pins still gives me a nice gap between 20-30 even at those arrow speeds.
I tried shooting 1 pin from Zero-30+ and just never really trusted it. I like precise aiming and have no problem at all with the way I do it.........If I had those big annoying .039pins or bigger and brighter it wouldn' t work, but the way I have it I have it with fine aiming points it' s no problem seeing THROUGH the gap which is very important to me since at ranges between 20-30 or 30-40 I don' t aim with the pin, I aim with the GAP. I look at the point I want to hit between the pins and just aim with the 2 pins bracketing the spot I' m aiming at.
Actually very precise and I can really concentrate on a spot because the pin isn' t blocking it.
With a single 20 yard pin and then a 40 I wouldn' t be able to do this.

My mind and my body is trained to shoot " Gapping" pins and I can do it unconciously and very accurately, so I like the 20-30 pins.