Systems, methods, and computer-readable media for adding and removing unanchored small cell sites for a cluster that delivers precision time protocol frequency and phase synchronization over a network without on-path support are provided. In embodiments, the method includes continuously measuring, in an asymmetric network without on-path support, an anchor path delay. A maximum standard allowable (MSA) delay variation is determined for the cluster. A respective round trip (RT) delay is continuously measured from the host site to each unanchored small cell site in the cluster. The anchor path delay is compared to each respective RT delay to determine a respective unanchored delay variation. In embodiments, unanchored small cell sites are be added to or removed from the cluster based on a comparison of a respective unanchored delay variation to the MSA delay variation.