I shoot 275 fps and with the slick trick 125's they fly exactly where my FP's do. I shot the slick tricks last weekend for the first time after only screwing them on and spin testing them and WOW was I surprised. Excelent flight.

There is no reason that you could not get fixed blade heads to fly just as well as mechanicals if your bow is properly tuned and you choose the right head for your arrow spine. Keeping in mind that smaller (not necessarily smaller cutting diameter) more compact heads will usually give better flight than heads with very large, long blades.