may not be worth your money. but many heavy pieces of equipment use full hydro all day like fork lifts. i drive a tractor at times up to 14hrs a day for the whole month of oct and some of sept and November and have never experienced fade except when it developed a leak and ran down the reservoir. and you did say you were running out of room.
the guy here claims there is no fade at all.
http://www.pirate4x4.com/tech/…ydro_Steering/index3.html
just saying could be a solution to putting the ram out where its going to be knocked on. if your already hydro assist your not far from a full system.