I would say that the only remedy to impeding traffic provided in the impeding traffic law is speeding up. One cannot be guilty of violating the impeding traffic law for failure to operate FRAP, for example. FRAP is its own law; violations of it should be cited accordingly. Similarly, one cannot be found guilty of impeding traffic for not turning out; the proper charge is for failure to turn out.
FRAP compliance often prevents a driver from causing other traffic to slow and back up, but not always, and that is not its only purpose. Operating FRAP discourages overtaking on the right, which increases safety. It also improves sight lines for drivers preparing, but not yet able to, overtake on the left. This also improves safety. Operating FRAP to provide these benefits but without preventing traffic from being impeded is still worthwhile (so long as it does not encourage overtaking where there is inadequate space or conditions are unsafe).