The Raptor head is inherently unstable dynamically in its stock form (set up with the blade pitch controlled from the trailing edge as they are) making it very succeptible to pitchiness and flutter. This will be most pronounced when used with a destabilizing type of paddle (KSJ) or the less stable type of rotor blades. (Other head designs control such combinations a lot better).

If you use more stable blade designs like the Hurricanes, FunKey, V-Blades, Leisure-Techs, NHP's etc (blades with better matched chordwise c of g's with feathering axis and their center of lift) this pitchiness can be minimized. Blades that are not as well matched in design, (e.g. the old version of the V-Blade, ATS blades, Sung Woo etc.) will agrivate this tendency.

This natural pitch tendency of that head design will also be agrivated by any swashplate slop (between the inner and outer stars), in the rocking slop that develops between the mainshaft and the washout hub and/or in the seesaw mechanism.

If you tighten everything up and get some stable blades, your problem will become very manageable.

Or you can go to a heli with a more advanced head design.....some such advanced heli heads were designed years before the Raptor hit the streets. Some of these more advanced designs are even present in other low priced entry level helis.