Well what are the draw lengths? Did you measure them?

I can see an LX doing 280 w/ a 410 grain arrow at 29" or more draw, but not a Legacy. I had 4 different Legacy models (two 29" cams & two 28.5" cams) and the fastest one was my left hand 29" (measured 29 5/8" AMO) and it shot 292 FPS at 5 grains/70 pounds (loop & peep).

The LX on the other hand will do those numbers all day long.

I use the same chrono for all my testing.