Mustangous,
Here is the answer; Last week I moved 9 bags of Sackrete (720lbs) . With the new pressure setting the FEL was able to lift it with no problem - would have tried more if I had more bags - not sure how much I could have lifted before the upgrade. The issue that came up was that over bumpy ground I got some creepy flex at the mounting point for the loader arms.
Of course that spelled quality monster garage time to me: I fabbed these struts to transfer some of the load to the front bumper, and in the process painted the front bumper to match the canopy arms.