I'm not an expert on hydraulics but what the Rapid Extend Control Valve does is make it so you don't need a two stage pump on a small gas engine. It can't speed up hydraulic flow of your tractor. To do that you'll probably have to either convert it to a PTO powered pump to get more flow or swap out the hydraulic cylinder for a smaller one to reduce the amount of fluid needed. The problem then comes down to just how much do you spend on modifying what you have vs just buying a stand alone splitter (or 3pt). For me I ended up with a stand alone and I use my loader to lift large rounds up so I can just roll them onto the splitter.
Do you know how big the cylinder is? I'm sure someone here can tell you how many tons it develops. My stand alone is suppose to be 27 tons (but probably less) and has never had a problem splitting anything. How far does it extend? Most people use around 16" for their fireplaces. If the thing can extend 30" or more then you can help speed thing up by not letting it retract (if you don't already) all the way back between rounds.
