You have to wrap the ear guides so they press against the back of your ear. Their cable and construction is no different than any other CIEM regarding cable noise.
People need to stop making sound quality statements on very revealing kit before they have 100hrs of use. It can be misleading.
3rd is that even though they feel like they fit, the bores may be partially restricted by either your ear geometry or wax. You wouldn't be the 1st to clog a CIEM on 1st listen.
JH13 may not be for everybody but congested in not an apt description of any working pair.