Guiding (Phd2) and goto (Synscan handset/app/SkySafari) are different things. Guiding requires a second smaller telescope and dedicated guide camera to make continual adjustments to the motion of the mount to keep the target centred. Goto sends the mount to the required target based upon the location/date/time inputted into the handset or from the mobile device, after which the mount is left to its own devices to move at 15o /hr until another goto command is sent to the mount by the operator. Goto is quite dumb in this respect, it points the mount at where it believes the target is based on the information but doesn't know if the target is where the mount is really pointing. The tracking problem could be due to either bad balance or a problem with the mount.