3Bladz
The 9.1 gpm is what they call "work" flow. (The steering is 6 gpm and the front aux hydraulics with high flow are near 27.9 gpm). It think work flow is the flow to most of the cylinders and 3 pt. Most of the toocat cylinders are 2.5" bore cylinders and it doesn't take a lot of flow to move them relatively fast. Most mid to larger CUTs will run in the 7-9 gal range.
Until I reviewed the manuals, one doesn't realize just how many hydraulics curcuits and valves are in one of these machines. Valves for lift, tilt, pto motor, power steering, 3 pt. rear hydraulics, front hydraulics, power bobtach etc. Most hydraulic valves have check valves as well. Yet, I will probably add another 1-2 sets of hydraulics. Looking at the scematics, I should be able to put another set of couplers in the back and one in the front. There is a hose going to the rear hydraulic valve. I should be able to splice into that with a selenoid valve/diverter and get another 2 sets of hydraulics.
I had considered increasing the psi for the rear lift but probably will leave it alone. I am considering drilling new holes for the stabilizers back a couple of inches in the link arms. Then use the existing stabilizer holes for the adjustable lift rods. This will put the lift rods back a few inches and increase the lift capacity a little without significantly changing the geometry. I could also just place the lift arms in new holes behind the stabilizers. May have to do a little experimenting.