You should clearly understand the differences between Collective Bounce and Pylon Rock.
Collective Bounce can and will kill you if left unattended. Before further flight, I would ensure that the collective minimum friction check is complied with and rectified if neccessary. This is absolutely required to prevent any rotor forces, not contained by the hydraulic system, reaching the flight controls. You as the pilot should be the only one who inputs control change to the collective servo. However, in a damaged system (loose rod ends, universals, servo uniballs, etc., rotor forces can cause an uncommanded input to the servo, increasing in amplitude and spoiling your day.
And definitely ensure that you are using approved cables for your loads, nothing that provides elasticity in the line.
Pylon Rock does not increase in amplitude to a destructive force on it's own but it can become quite uncomfortable for pax and crew.
Pylon rocking of two to three cps is inherent in the 205 rotor, mast and transmission system. A rubber mounting and dampening system is used to keep this to a manageable level. Rocking can be magnified on fixed floats or heavy internal/external loads and is more noticeable when hovering IGE/OGE and during T/O and approach.
You can verify rocking in the hover and in forward flight. (These checks are available in your manuals). You simply do the cyclic inputs and check to see that the system is dampening the rock in the required time. If it does not, there is a problem in the dampening system.
And please do not forget the collective minimum friction and always know that it is available to you. If it isn't, get it fixed. I believe that it is still a 100 hr. requirement.
Gerry