You say "ran off the rear", I assume you mean off the hydrostat??
The internal pump is small, but is large enough to operate a loader. If the system seems weak, check the charge pump output pressure and correct as necessary. It's in the chassis service manual.
If you add a pump, you will have to add a reservoir. Plus all that work. I'd just fix the charge pump pressure and see how it works.
If you think one cylinder has air in it, all you do to remove it is do a couple complete cycles of the cylinder. Full up to full down. Air can make it "lag" behind, but I doubt that is the issue. A "T" hydraulic system will split the load equally between the two cylinders. If one is behind the other, it's likely that the builder didn't get the frame made the same on both sides.
But, if you want to make a mount, and reservoir, do all that plumbing.... be my guest. You may find you have the same issues still....
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