First a question, and then maybe a suggestion, Is your valve that you are using to run the saw motor power beyond capable. If it is, then this is my suggestion. Provided the saw valve is power beyond capable, you can use the power beyond to tee into the inlet side of you spliter valve to provide extra flow to the splitter circuit. You need to install a check valve between the saw CV and the splitter CV to prevent back pressure, and you could install a unloader valve between the check vavle and the splitter valve to allow the circuit to act like a two stage pump. Where as when the slitter isnt seeeing high pressure the oil from the saw circuit would pump thru the splitter circuit increasing splitting speed, but when pressure reaches a set amount, the unloader vavle would dump the saw circuit back to tank. When neither circuit is being used both the saw circuit and the splitter circuit would dump back to tank thru the splitter control valve. With this method, you could mostly use what you already have and only need to purchase a unloader valve and a check valve and what ever hoses and fitting needed to hook it up. Now doing things this way would mean that if your saw is running, there wouldnt be any extra fluid to speed up the splitter, but as soon as you stop sawing, you would see a very noticeable increase in splitting speed. I suspect that after a round is dropped in the splitting trough, that the saw isnt running while you are splitting and advanceing another log to be sawn so this is just fluid that isnt being used. this method wont effect the way the saw runs at all and will allow you to use the extra fluid from the saw while it is setting idle.