In this work, we provide a facile method for the derivation of "optimal" field profiles in experiments with magnetic field cycling that require little or no theoretical effort. We demonstrate that field sweep optimization is possible by considering only the field dependence of the average 13 C polarization in PHIP transfer experiments. Both experimental measurements and theoretical calculations of such a field dependence are straightforward, even for complex spin systems. To support our approach, we conduct a set of three experiments with PHIP transfer at ULF: (1) hydrogenation at a fixed ultralow field, (2) coherent transfer induced by an instantaneous field jump, and (3) adiabatic sweep of an ultra-low magnetic field. Performing hydrogenation at different fixed ultralow fields yields the field dependence we need for the optimization. Experiments with instantaneous field jumps prove the coherent nature of the polarization transfer and provide insight into the efficiency of spin mixing at a particular field. Finally, adiabatic field sweep experiments allow us to compare the performance of linear and "optimal" sweeps. To demonstrate the key features of ULF PHIP transfer in various spin systems, we conduct experiments with two molecules, maleate and allyl pyruvate. The spin system of C-maleic acid consists of only two protons and one C nucleus, similar to C-fumaric acid, an important biomolecule with high promise for PHIP studies . On the other hand, C-allyl pyruvate provides an example of a non-trivial spin system comprising eight protons and one C nucleus. The enhancement of the C nucleus of its pyruvate moiety is the basis of PHIP Side Arm Hydrogenation (SAH), a method that offers an attractive option for hydrogenative PHIP in biomedical surveys . We report both experimental and theoretical studies of coherent PHIP transfer to provide a detailed procedure for the optimization of magnetic field cycling experiments.