Yeah, that doesn't surprise me... The Plasti Blades are after-market, so Horizon did not do testing with them. The data posted above is with all E-flite equipment only, I'm sure.

Changing something as critical as the composition of the blades certainly can skew the data.

Have you, by chance, measured the cord, and root to tip and compared to stock blades? I'm curious if they have the same diameter and surface area??