Hello,
I just went through all this on my tractor. Definitely go with the zero pressure connection to your reservoir, not with a low pressure line return. Low pressure quickly becomes high pressure when you are dumping that quantity of fluid in a split second. Your ram won't deliver the maximum force if it's fighting any pressure at all. Also, keep an eye on your hose fittings, and avoid constricting the flow smaller than 1/2". In other words, choose a return hose that will have fittings with a minimum of 1/2" orifice.
I just went through all this on my tractor. Definitely go with the zero pressure connection to your reservoir, not with a low pressure line return. Low pressure quickly becomes high pressure when you are dumping that quantity of fluid in a split second. Your ram won't deliver the maximum force if it's fighting any pressure at all. Also, keep an eye on your hose fittings, and avoid constricting the flow smaller than 1/2". In other words, choose a return hose that will have fittings with a minimum of 1/2" orifice.