Melee Gun Thrashing

I guess this makes no difference. If the targeting is sound, it should be within 40/distance on this turn as it is at zero at the next turn. Anyway, this will not solve your trashing issue :). If the gun is on its way to lets say PI and the next turn the targeting decides no its not PI its PI/2 your gun will trash between the targets and will not shoot at all for the time it 'trashes' between two headings.