The installation of the new ITER-like ICRF launcher [1] in JET is expected to increase the total coupled ICRF power by about a factor of two. The effects of the increased power on the performance of ICRF heating scenarios used in JET deuterium-tritium (DT) plasmas are investigated and optimised using numerical computer modelling. The optimisation includes tailoring the profile and energy of ICRF-accelerated ions using multiple frequencies to maximise bulk ion heating and/or fusion reactivity.