The loader cylinders are most likely smaller volume (even combined) than the splitter ram which is probably why the loader cycles fast. The valve controling the remote couplers on the tractor could be restrictive, hence the elevated oil temps.
Usually the proper way to hook a log splitter to a tractor hydraulic system is via a Power Beyond kit, similar to a backhoe. You would need to replace the valve on the splitter to do that. Usually that is the only way to take full advantage of the tractor's hydraulic pump flow and keep hydraulic oil temperatures acceptable. The remote circuits on most tractors is not designed for the constant duty cycle of a log splitter.
Beware that many tractors have two hydraulic pumps, one for steering and one for implements. Often when rating the hydraulic system's flow, manufacturers will use the combined output of both pumps and advertise that number. (Which is complete horse$hit if you ask me but hey, I don't have a marketing degree.
) Ths often leads the tractor owner to believe they have much more hydraulic flow capability than they really do.
The Deere 3032E in your signature has a 4.0 gal/min steering pump and a 5.3 gal/min implement pump. On it's best day, with an ideal hookup, the 24 Ton splitter (I'm guessing it's a 4" cylinder) is going to have a cycle time of 35 seconds. By comparison, a $1099 (frequently on sale for $999) Huskee 22 Ton splitter will cycle every 14 seconds. Also, the 3032E has the hydraulic relief set at 2500psi so that's going to limit your "24 ton" splitter (assuming a 4" cylinder) to 15.7 Tons.
I'd suggest selling your current splitter and picking up a self-powered model or a PTO pump tractor-mounted model.
