I too had this.... Was going to type problem, but it's more like a characteristic. The stock woodies are ****e & cause a lot of turbulence. Slap on a pair of glass or carbon fully symetricals and up the head to about 1700. I also use 15% ProSynth & a hotter plug. I never got the low speed wobble.... Probably because I never do anything at low speed
Regards. Ian F.